The foot is a limb that is not given much importance when compared to other vital organs such as the brain or heart. However, the foot is a very complex mechanical structure that is made of 26 bones, 33 joints, and more than 100 muscles and ligaments. About a quarter of the bones in the human body and about a fifth of the joints are found in our two feet. That is why Leonardo da Vinci described the human foot as an engineering and artistic masterpiece.

A healthy person takes about 5,000 steps a day. Given a life of eighty years, a person takes about 150 million steps throughout their life. Assuming that each step is 75 cm, a person walks about 110,000 kilometers throughout his life. This corresponds to walking around the equator about 3 times. Apart from that, a typical person stands for around 2-4 hours a day. During all these activities, the human foot carries the entire body’s weight. In standing position, body weight is supported by two feet while activities such as walking and running are done by only one foot for a certain period of time. While standing, the feet carry 100% of their body weight, while walking, this rate rises up to 150%. While walking, the foot that needs to be lifted from the ground approaches the ground again with an acceleration in the same direction as gravity. Therefore, the impact force at the moment the foot touches the ground corresponds to 150% of a person’s body weight. In cases of severe effects such as running and jumping, this force easily increases up to 5 times the body weight and up to 10 times in some people. For a person weighing 70 kilograms, this force can be 105 kg (or about 1050 Newton) in walking, and easily 350 kg (or about 3500 Newton) in running or jumping. Assuming that a person walking for an hour takes 5,000 steps, the foot pulls a total of about 500 tons of load (5,000 steps x 105 kg). In running, this figure will increase approximately three times.

The foot has been created with a wonderful mechanical and construction design that is able to consistently sustain such high loads. The bones and muscles of the foot add two different belt designs to it. One of them, the structure called the longitudinal belt starts from the heel bone (calcaneus) and ends with its metatarsal bones (Figure 1). Some researchers claim that the long arch is divided into two parts as the inner (medial arch) and the outer arch (lateral arch). However, both structures resemble bridges built in arches. The second arch on the foot is called the transverse arch. This belt is perpendicular to the long belt from the right side of the foot to the left side and is shorter in length (Figure 2).

Therefore, the foot is a marvelous structure consisting of roughly two arches. This structure of the foot can be compared to arch bridges or a dam. The arch structure is known as the strongest structure against steep loads in construction areas due to the robustness of the designs against compression forces in cases of vertical loading. Therefore, hydroelectric dams are constructed in the form of arches or arcs in order to make the most resistant model against hydrostatic pressure.

The arch structure of the foot is very flexible and can also move up and down like a car suspension and acts as a shock absorption. If there was no such structure on the foot, the impact forces during walking and running activities would be higher and cause chronic foot pain. The flatfoot complication is a result of a damage in the arch structure in the foot which comes from birth or develops afterwards. Flatfoot patients are often unable to perform long-term activities and experience foot pain as well as complications in other organs of the body.

Our feet’s arch structure is not the only factor involved in shock absorption that is designed against mechanical forces. The layer of fat on the bottom of the foot also contributes to this process. In a healthy person, this fat layer, which has a height of 2.5 cm under the heel, drops to 5-7 mm in the front part of the foot. It also helps to distribute the vertical and horizontal forces caused by standing or walking evenly on the sole of the foot. At the same time, it serves as a source of heat insulation and helps protect our feet from hot or cold surfaces. In some diseases such as diabetes, in which this fat layer melts or decreases, wounds called foot ulcers can develop because the shock absorption and load distribution get damaged. Mechanical pressure is calculated by dividing the amount of mechanical force by the surface area on which it is applied, meaning that smaller surfaces areas are subjected to more pressure. This is why very tiny needles, despite weighing almost nothing, can pierce our skin and cause pain. Similarly, damage to the fat layer under the foot causes the forces applied under the foot to act on a limited surface area. For example, the reduction of fat in the area just below the heads of the metatarsal bones reduces the “cushioning” effect in this area and causes a pressure in high values. This extra pressure can cause tissue damage along with the aforementioned foot ulcers.

Such a situation that will cause pain in a normal person cannot be felt by many diabetics. If diabetes is not well controlled, neuropathy or a “lack of feeling” may occur as a complication. Dead nerve cells become unable to feel pain which can result in people not knowing about harm that is being done to their body. Diabetic patients who develop neuropathy would not feel fatty layer damage and accompanying high pressure values whereas a typical person normally would. Untreated foot ulcers can become infected and can turn into gangrene. Since the gangrenous foot has to be cut, diabetes unfortunately causes a large number of amputations. Such amputations are sadly quite frequent throughout the world due to diabetic neuropathy. Dr. Paul Brand, who studied diabetic foot ulcers, defined pain as a gift from God that no one wanted. Sometimes, what we do not like might be better for us (Qur’an 2:216); likewise, pain can cause a lot of trouble to people but it can also alert us of dangers and harm to our bodies.

Thus, foot care is very important in diabetics. The following three actions are recommended to patients; daily inspection of the foot; daily washing; and control of the inside of the shoes. The pest, pebble, or similar hard object in the shoe that can be very harmful for diabetics with loss of sensation would be removed this way. On the other hand, when such a hard object remains in the shoes, patients may step on them repeatedly without feeling it which will likely lead to an ulcer case.

With its pain that works like a health alarm, extraordinary mechanical loads it carries, heat insulation and shock absorbing features, the human foot is a wonder of art that calls for contemplation.

How good are we aware of the operations of systems and mechanisms that make us walk?

Costly research and development efforts are under way in centers throughout the world seeking to build walking robots by mimicking human mobility. After 14 years of research, automotive firms built Asimo, a robot which can walk bipedally and climb stairs like humans. Even though the moves Asimo could make matched those of a one year old baby, it was still considered a great success for the robot technology.

Hardships encountered during these research projects proved walking to be a great miracle, apart from normal habits of movement. We often become aware of how extraordinary movement is and that the moves we repeat hundreds of times, such as walking, running, bending, sitting and standing, are blessings granted to us only when we see someone who has lost some of their mobility.

That humans can walk bi-pedally is truly exceptional. Most organisms have a front leaning skeletal structure and walk on four extremities; they only stand upright when absolutely required to, since it is very difficult for them. Human ability to stand upright and walk on two legs truly signifies them as special amongst creatures, and sets them apart from all of creation. The lively, regal posture of dexterous bipedal humans constitutes very important evidence showing they are “the most superior of all creatures.”

The multifunctional, flexible nature of our skeletal system enables us to complete very simple moves automatically. Walking seems to be a very easy task, however, it occurs as a calculated outcome of many factors, such as determination of stepping distance, the toning of corresponding muscles of the same and opposite direction, relaxation and contraction levels, and relocation of the body’s gravity center.

Walking takes place via the coordinated works of the locomotor (musculoskeletal) system, motor control system, and balance-coordination system.

Locomotor (musculoskeletal) system

The framework of the human body is built together with 206 bones of variable hardness. With their strong nature and capacity to endure extra weights, bones takes up 20% of a body’s mass, and are the major load bearing part of the body’s structure.

The main part of our skeleton is the vertebral column. It consists of 33 small bones, known as vertebrae, positioned on top of each other. Wear-preventing discs are found in between vertebrae to protect against motion related wearing over time. As the vertebral column holds the weight of the upper body, it is created in a way to keep the body upright. The spinal cord inside the channel that is surrounded by the vertebral column is a very important signaling network providing coordination between the brain and other organs.

Joints and ligaments are among the moving parts of our body. The most important joints for walking are the hips, knees, and ankles. The curvy shape of the foot and its contact to the ground at three spots supports bones against body weight and helps with balance. This is why flat footed people struggle with walking and get tired easily. The curves of our spine at the neck, back and waist regions, and the hips, knee joints, and curvature of the foot, are perfectly shaped for standing upright and walking.

In order to move we need a muscle system along with the skeletal system. Muscles are made up of thousands of contractible muscle fibers. There are more than 6 billion muscle fiber motors in the human body. We walk, run, eat, breathe, talk and do many more moves by using ability granted to muscles. Approximately 35 muscles in each leg, and around 100 muscles in the whole body, function during walking.

Ligaments and tendons are links that secure bones and muscles together; they also help to stabilize joints, thus when standing, joints remain in place without muscles contracting.

Four different mechanisms are involved in walking:

1. Proper upright posture and maintenance of balance during walking
2. Forward motion of body via muscle power
3. Reduction of shock-impact effect while stepping
4. Maintenance of motion with the least amount of energy.

A series of movements is generated in the legs to provide a forward motion and these are constantly repeated. These constant repetitions are called the “walk cycle.” The “passing pose” is defined as the time frame when the leg is in the air, and the contact pose is the phase during ground contact. In the middle of the contact pose, even though body is in balance, because of the forward momentum of the body, balance is lost, thus the body leans forward. Balance is then restored by stepping on the ground with the leg in the air. As a result of this rhythmic loss and restoration of balance, the body moves forward.

In a person standing upright, the center of gravity is in front of the fifth vertebra. At the start of a walk, the body leans forward to carry the center of gravity towards the front; then the initiation of the motion via forward transfer of the power with toes and joints takes place, followed by the lifting of the heels, the bending of the knees, and the lifting of the foot, thus displacing the center of gravity of the forward leaning body towards the front.

Balance should be maintained when one leg is lifted in order to let the other leg carry the load of the body’s weight. The gravitational center of the body is located in the distance between the two legs since each leg is located on the side. Body balance is maintained by the contractions of dorsal muscles located across the side of the stepping foot, working in parallel to support and transfer body weight to the foot via the hip and femoral muscles. These events happen so quickly that we often do not even notice all the complicated processes.

The great Sufi figure Abdul-Qadir Gilani was often asked questions such as, “Master, show us a miracle.” He would stand up to walk three to five steps and sit back down. Everybody was confused, looking at each other. One person among them was heard saying, “Master, excuse us but we can all do that as well.” Gilani replied then, “Is there a greater miracle than walking? You see it, but do not understand.”

Motor control of walking

Bodily motions are controlled via the primary motor centers that are located on the side and cortex region of the brain. These centers are created in a way to prepare and organize motor programs involving body movements, and to integrate them with the proprioceptive memory. This synthesis of information enables the adaptation of motor commands to the present posture of the legs and arms regarding intended moves.

A desire to make a move is a necessary prerequisite for the stimulation of muscles pertaining to it. If we want to hold something, we can easily do it; when we want to raise our arm, our elbows bend; to run or walk, our leg muscles start to move and work. How do all of those moves happen? Is our desire enough to do so? Can the guidance of all the bones and muscles, working together towards the same target, happen by itself or occur via coincidences?

In order for muscles to move, our thoughts must be relayed to them and this is provided by the nervous system and nerve network. There is an amazing communication network present in our body. In case of an intended move, an electric signal is sent by the brain. During this journey, which seems to be complicated, the signal arrives at the spinal cord and then quickly diverts to the corresponding organ. Millions of motors that make up the muscle are stimulated by the electric signal, contracting the fibers instantly upon reception of the signal. In order to do a coordinated move, it is necessary to know the related body organs’ positions and their relations to each other. Millions of transmitters that provide this information have been placed throughout the body. This data come from the eyes, the inner ear’s balance and sensory organs, muscles, joints, and skin. There are billions of micro receptors located in muscles and joints programmed to send instantaneous positions of the body to the central nervous system. In every stage of a move, the positions of the muscles are reported instantly to the command center by these micro receptors inside the muscles. New commands are given to the muscles based on the assessments made here. This way, each second, billions of bits of information can be processed and assessed.

The cerebellum is another center that is in charge of functions such as maintenance of balance during walking and standing, carrying out proper and coordinated moves with visual control, providing coordination among muscle groups, promptly starting and stopping movements, and the maintenance and organization of normal muscle toning. The cerebellum is tasked primarily with hastened muscle activities like running, typing, and talking. Thus, fast moves necessary for the balance system are sustained properly and successively without abnormal oscillations.

Specific motion templates have been programmed in the spinal cord for all muscle-covered regions of the body. Rhythmic movements, such as forward and backward motion of the legs and arms, and coordinated activities of other body parts in tandem with walking, are controlled here. The task to control repeated moves like walking is assigned to the nerve network consisting of the spinal cord, brainstem and cerebellum.

Balance and coordination system

One of the requirements to walk and move is to stay in balance. Despite our advanced musculoskeletal system, without balance, this system of ours would be useless, or even dangerous.. Our balance system, which is in charge of the instantaneous control and fine adjustments regarding our body, is granted to us as a blessing of Divine compassion.

There are three systems that provide data involving the positions of the head and body: vestibular system (the apparatus of the inner ear), visual senses, proprioceptive senses

The vestibular structures are an essential part of the balance system. They are found in the inner ear, and are small and complicated systems. This 6.5 mm diameter wide system is composed of semicircular channels that contain specific fluid and ciliated sensory cells that cover the inner linings of the channels. This system constantly reports information involving our status in the outer world and instantaneous changes to the balance system.

When we move, the fluid inside the semicircular inner ear channels get displaced; this motion vibrates the cilia. This vibration causes an electric signal to generate in the cells. This electrical signal is then transmitted to the cerebellum; received information gets evaluated instantly in the cerebellum. This system is created to function autonomously without our will and control. When this system is impaired, balance disorders occur, such as dizziness.

Information regarding our position in the environment and the relative status of the environment according to us is sent to the cerebellum and brainstem via our visual senses.

Proprioceptive senses are formed via the activities of tension receptors built in muscle fibers, tendons and joint capsules. These are sensitive to motions and positions. These receptors regularly provide information to the central nervous system. The cerebellum receives information from all the muscles and joints of the body, including the eyes. These inputs are analyzed very promptly at the cerebellum, and the relative gravitational position of the body is finely calculated, thus the proper motions of muscles are determined. The resulting response is relayed towards muscles by nerves. These events take place in a time frame that does not even last for a hundredth of a second. We easily walk, run, and do complicated moves without feeling any of these activities happening inside us. Yet the calculations taking place in our body even for a single moment of those movements can fill thousands of pages.

To understand the fascinating side of our ordinary movements, let’s consider a person climbing up the stairs. First, the eyes scan the surroundings, then the three dimensional information of positions acquired from the materials and belongings in the environment are transmitted to the brain. Once received, the information is analyzed and the necessary commands are sent to the target organ from the motor centers of the brain. Commands passing through related tracks and centers finally arrive at the musculoskeletal system. Many factors, like the height of stair steps, length and depth of the foot step, center of gravity and position of the body, are calculated and determined almost instantly.

Proprioceptive signals constantly report the positions of organs, like the arms and legs, to the command center. Inner ear receptors are in charge of the prompt transmission of information necessary for balance, like motion, speed, and direction of the body. These inputs are calculated in milliseconds at corresponding centers in order to maintain the coordination and harmony of the entire body. A person who is running up the stairs may think to jump a couple of stairs. This change of command is rerouted to the locomotor system as a new and different command from the brain. All of these processes are completed in centiseconds. In the mean time, the head, shoulders, and arms are employed for rhythmic oscillations in order to adapt to the overall body momentum.

In conclusion, standing and walking are miraculous and take place via thousands of interrelated activities. Nonetheless, we usually do not notice any of the thousands of processes that are constantly taking place. One hopes that every blessing we have is seen through the window of thanksgiving and appreciation.

Kemal Serce is a professor of veterinary medicine in Bursa, Turkey.

Every human is precious with a special quality, and there are quite many of them at specialist schools. It is just a matter of being able to see that potential within every person, and be appreciative of

When I was requested to complete one of my practical teaching experiences at a specialist school,¹ I was worried. At the time, I was enrolled at a university to become a teacher, expecting to teach only at mainstream schools. The fear of unintentionally hurting the feelings of handicapped people in general was a big concern for me.

I prepared myself for the difficult task ahead. I was certain that this experience was going to be quite different to what I had previously encountered in regular schools, but what I experienced from the first day was beyond my imagination. I was surrounded with little children who could not see, hear, talk or walk. Normally, lunch time would mean kids running around and jumping with joy. It wasn’t like that here. Instead, there were a lot of students on wheelchairs, some walking slowly from one part of the room to another, some just sitting quietly, and some crawling on the floor. As I was watching them, I noticed a little boy approach. He crawled next to me and then patted the floor. I interpreted this as him asking me to sit next to him, so I kneeled down and said “Hello.” He reached over and gave the toy he was playing with to me and then crawled away slowly. For a brief moment I held the toy in my hands looking around confused. I did not know what to do.

Mike² was one of the four students in my class. He was visionally impaired. He could not walk either hence had to use a wheelchair. What was so lovely about Mike was his responsiveness; he would respond to everything, even to a question directed at someone else or to a conversation other people were having. Mike was one of the triplets; according to my mentor “he was the unlucky (!) one.”

Sam was another student also with limited vision. Some days he would surprise us by recognizing the person who walked in through the door; however, most of the time, he could not see objects that stood right in front of him, often tripping over them. Walking was also a difficult task for him; his teachers were teaching him how to use a cane. He was a popular boy at school. He would talk to everyone and most importantly, he would never forget them. His parents were considering enrolling him into a different specialist school due to his exceptional memory and fast learning skills.

Shane was the third student who could not speak. He was also using a wheelchair. Teachers were working vigorously to teach him how to use a machine that would assist him with his speech and also how to operate an automatic wheelchair.

Lana was the last student of the class who had difficulties with walking. In order to walk she needed support or had to use a walking stool. She displayed signs of timidity next to strangers, yet her friendliness towards the three boys in her class was remarkable. She would constantly talk to them and attempted to walk towards them. She was very responsive to some of our questions, but not to everything. If you insisted on a response, she would place her head on the table and start to ignore you.

Eating was an issue for both Sam and Shane; they had to be given some kind of a special formula instead of regular food. The formula was made up of a milky substance and it satisfied their hunger. It provided them with all the necessary minerals and vitamins that they could not receive from regular diet. Although teacher-aids would come at certain times to give the students food, it was not to satisfy their hunger; rather, it was to give them the opportunity to experience different tastes.

Everything in this school was new to me, so I was extremely cautious with everything I had to learn. Teachers and staff seemed to be very nice and talkative to the children. Initially I could hardly even talk to the students. If they had a question, I would reply with a smile. With each passing day, I grew confident. Before long, I was like their regular teachers who constantly talked and laughed with them. I began to assist my mentor by moving students around with wheelchairs.

The friendship and the relationship students had with one another were genuine, pure and innocent. They were just like other children; thinking about toys, playing games, and more importantly, cherished the love they received from family and friends. They had wants, needs, fears, likes and dislikes just like you and me. The importance of being able to “see the person, not the disability” meant a lot to me.

At this school each student had a machine called the “Big Mac.” The teacher (my mentor) would record information about students’ day at school and parents were also expected to record issues relevant to home. Every day, these Big Macs would travel to and from home with the children. The teacher and parents would listen to them. Shane had to use a more advanced machine called “FL4SH” to help him with his speech. He had to press a button with his head to indicate what he wanted to say. Every day Shane’s mother recorded news and jokes on this machine. During my entire time there, she recorded a message almost every day. My mentor would describe Shane’s mother as the best parent she had ever seen. It was at this school, I realized the sacrifices both parents were required to give and how much they should all be applauded for it.

Normally, it took students a long time to learn my name. I believe it is due to the difficulty of its pronunciation. However, at this school, the time it took for the students to learn my name was quite shorter than any other schools I went for placements. Mike was the first to pronounce my name… He would repeat my name so many times that it would be impossible for those nearby not to memorize it. I tried desperately to reply to all of his calls, but it was an impossible task.

Sam was a Sesame Street fan like any other child; his favorite toys were a vacuum and a car that had the pictures of Elmo and the Cookie Monster on them. He carried these toys wherever he went. He would hug, kiss and talk to them. One day, he began to say things like, “Rukiye the vacuum is sad” or “the car is crying!” I asked him, “Why Sam?” He replied, “Because, they can’t talk.” I smiled and suggested, “Why don’t you teach them how to talk, Sam?” I encouraged him to continue talking and to tell them “don’t be sad, don’t cry, be happy.” He never forgot this conversation. He began to repeat the words “don’t cry, be happy” to his toys, whenever he was next to me. I just loved the way he taught the vacuum how to talk. He would say “don’t cry vacuum, you can talk now” then he would press the “on”’ button, to which the vacuum would respond by saying words like “Hello.”

Sam’s birthday was another memory I would never forget. It was his ninth birthday. The following day, my mentor asked Sam to talk about his birthday to his classmates. He told everyone that he and his brother were sharing the same party due to having birthdates that were not too far apart. He continued talking about blowing candles and everyone clapping. He concluded by saying “Then I went into my room.” When my mentor asked follow-up questions like, “did you stay in your room after that?” and “didn’t you enjoy the party Sam?” rather than answering the question, Sam continued to describe the cake, candles and the singing of the “happy birthday” song. I was saddened by the story of Sam’s birthday party. I tried to contemplate how it must feel to not be allowed to attend your own birthday celebration. My mentor assumed that it was to prevent Sam from screaming loudly as he always did when he became over excited.

One day, I witnessed Sam’s unique emotional state with my own eyes. He was crying, constantly stomping from one place to another as he violently smashed and threw toys around. Even his favorite toys were amongst the victims. His sickness triggered this lovely boy to go through such a drastic emotional transformation.

On another occasion as we were waiting for the other students to arrive, Lana asked me to bring her a book. She imitated her teacher and pretended to read the book to Sam and me. She repeated the words “you can walk, he said; I can walk, she said” on every page. I wondered why she concentrated on these particular words. Was it because of the difficulty she experienced while walking? Perhaps, in her own way, she was expressing her desire to walk.

Observing these lovely children helped me realize how little we are thankful for what we have. We have so much, yet often we fail to display our gratitude. We often compare ourselves to those who are more fortunate, rather than thinking about those who have much less. If we are disappointed about not having the latest shoes, shouldn’t we remember Shane, Mike or Lana, who could not walk? If we complain about not having the best eye color, shouldn’t Sam or Mike be remembered, who could not see? If we cannot be bothered to talk with our family at dinner, shouldn’t we remember Shane? Because no matter how much he wanted to say a simple sentence like “I love you,” he was not able to.

It was my last day at this specialist school; a place I initially had doubts about attending. I bought each student a toy, and showed them how it lit up when shaken. That day, moments before I left the class, my four students chanted, “Rukiye…Rukiye… Rukiye!” They had made up a song with my name. As I pushed Mike’s wheelchair towards his bus, he was still shaking the toy madly as he shouted with joy, “Rukiye, Rukiye look, I’m lighting it, I’m lighting it!” I wondered if he really saw the lights. I was extremely sad to leave them, but I had completed the requirements of my placement. I can never forget these lovely students. Their smiling faces, especially Mike’s shy giggles and Lana’s loud laughter are still echoing in my ears.

About a month had passed when I went back to the school for a short visit. I was curious as to whether the students would still remember me. It was heart-breaking not seeing Lana and Shane there because they were away that day. Sam and Mike were having their snacks; the usual, cheese balls for Sam and sandwiches for Mike. Mike did not say my name which he repeated so many times before. Instead, he smiled and giggled as I spoke to him. This was enough to cheer me up; it seemed as though he recognized my voice. My mentor asked, “Sam who is this?” To which he responded “Rukiye” with a huge smile. I spoke with Sam for a while and then said a last “goodbye” to both, as their teacher-aid took them outside for recess. During our short conversation, Sam did not forget to update me on the mood of his car: “Rukiye, car is crying… don’t cry car, be happy!” Eventually, the students may forget me. But one thing is for certain, I will never forget them…

Notes

1. In the Australian school system, institutions that provide education to disabled students are known as “Specialist Schools.”
2. Names of students have deliberately been changed for privacy reasons.

There was a peaceful silence and was pouring light upon light

Things were being done with the precision of clockwork;

Centuries-old confusions disappeared one after the other.

All were respectful to each other and behaved in sincerity;

Water of life was flowing through taps of porphyry.

Holy ones were as if on parade with faces bright with faith

As they walked, they gave strength to our hopes.

People were busy with founding a new world;

The earth was so luminous as if to compete with the sky.

When those heroes with penetrating sight passed by me,

I came to understand that mankind were in the time promised.

I saw young men with clear signs on their faces and concluded

They were those promised to come toward the end of time

I continued my way without stopping, nor becoming tired;

I met those who had absorbed light from the ‘grand fountain’.

Some, full of gratitude, were walking arm-in-arm;

Finally all reached their destination, which is the Pure Path.