Anyone familiar with this picture of life: a lady, do yourself a hairstyle or makeup.In general, at first sight, nothing interesting.Yes, if you watch the ordinary members of the fairer sex.Well, if these normal activities engaged girl from birth has no hands?
usmehnёtsya reader: "Nonsense, though!What it will be painted eyelashes, wind hair in curlers, if it has no hands? "The fact of the matter is that there is such a woman!Moreover, it is in fact not only copes with make-up and hair styling, but also brew their own tea, pours it puts in cup sugar and even drink a drink, carefully bringing it to his mouth.And she is doing all this down!
And yet this remarkable woman is able to write with a pen and typing on a computer, draw and even work with scissors if necessary.And all this she performs her amazing legs!Some individuals may even play a musical instrument feet, as though it may sound absurd.After all, the structure of the human foot is extremely similar to the structure of the upper limbs, which allows extreme conditions underfoot replace hands.
Of course, the above features are not basic to the whole population, it is rather an exception to the rule.Home to the lower extremities of a person nevertheless widely considered as a function of holding the body upright standing or squatting, and the adoption of the provisions of the emphasis lying and the function of movement, such as running, swimming, climbing, jumping and crawling on their bellies or on all fours.
Also legs are used by people for a long press and hold the various pedals.This skill is used by many driving machines, sewing on a mechanical or electric typewriters, work on the extractor connected to the drive and play the organ or Ionica
If we compare the structure of the human foot and the structure of his hand, it is possible to note a difference between the more-developed muscle massand stronger bones.It is known that the lower limb on average a quarter of all muscle!That is why much hard work, many shift to his feet.
For example, last legs used in winemaking and building material for the preparation of clay or adobe houses, clay utensils and toys products.And if you need to move very heavy thing it's best to stretch the back and push it down.
And how nice to filmah- "militants" heroes kick beat out the door!Yes, and in many kinds of struggle legs take exceptional pride of place, to say nothing.
Let's look at the structure of the human foot, drawing attention to the bones that make up the lower limb.There are three basic components: the femur, tibia and foot.
most solid and massive human thigh bone think.She and patella, which protects the knee joint of the hip.
next is the shin, which consists of a large and fibula.The structure of the human foot is much more difficult, as a part of the leg includes a large number of small bones.They number 26.
structure of the human foot so carefully and skillfully adapted to the life of a single person, that one can only bow to Mother Nature or the Creator.It is important every detail, even the smallest.
example, it should be noted that all bones of lower limbs connected joints.Joints in turn consist of the joint capsule, which is filled with a special lubricant called synovial fluid, and seals the joint.At the ends of the bones at their joints are hyaline cartilage, reducing friction during movement.
knee structure is different from other human joints in that it includes a meniscus cushion shocks while jumping and running.But since the meniscus can not be attributed to the bones, it is deprived of the ability to coalescing.And if during various injuries occur meniscal tear, the doctor is left with no choice but to simply remove the damaged fragments, which naturally reduces the mobility of the joint and in some cases bring human suffering, causing pain.
