Anatomy Lessons: Human Leg Structure
human - an unusual masterpiece of nature. Using the example of limbs, we can see the wisdom with which she created our body.The structure of the human foot is important to study and know well those who play sports or suffer from diseases of the venous system. Also, knowledge of anatomy will not interfere in the event that it is necessary to provide first aid.
The structure of the lower extremities
As the child grows up, the skeletal system, initially consisting primarily of cartilage, hardens. Therefore, the bones become more difficult to injure and break. The cartilage tissue plays a very important role in the joints. It helps the bones easily slide into the joints, so that we can move freely. The ileum, sciatic and pubic are the three largest bones of the pelvis. They are spliced in the hinge area and provide support to the torso. In the said cavity is located the hip joint. It includes the head of the femur, spinning, it allows you to rotate the limb.
Human knee structure
The strongest and most complex of all the joints of our body is formed by joining two bones - femoral and tibial. At the junction, each of them forms condoms, which are covered with cartilage tissue. In front of them the kneecap - a small oval bone adjoins. The protrusions of the tibia and femur are connected by ligaments. From above, the joint is surrounded by a periarticular bag, which is filled with synovial fluid.
Human foot structure
The total foot contains 26 bones: the bones of the tarsus (talus, calcaneal, scaphoid, cuboid and 3 wedge-shaped), the metatarsal and phalanxes of the fingers.
The bones, located in the foot, form the arch of the sole. They make the foot flexible and dynamic, allow it to serve as a kind of spring, spring when walking. When lowering the arch of the soles diagnosed flatfoot.
The role of ligaments and cartilage
Bundles - long strong strands of connective tissue - attached to the bones. They fix the joints, not letting them "loose", and also make the movement accurate. When the ligaments are torn, their fusion takes twice as long as the restoration of a broken bone.The knee is stabilized by four ligaments, as well as two meniscuses. Cartilage allows the joints to avoid inflammation during friction. The synovial fluid produced by the synovial membrane acts as a lubricant.
The structure of the human leg can not be described without mentioning the muscles. The front of the thigh is the most powerful of them - the quadriceps, bending shin. Tailor muscle also refers to flexors. It rotates the shin inward and thigh out. The medial and adductor muscles rotate the thigh inward, set it aside from the body and attach to it. The structure of the human foot in the foot provides stability to the limbs. The ability to raise and lower the foot, we owe the work of the muscles of the leg. Those that are located on the lower back legs - lift the heel, give the opportunity to stand on tiptoe. It is worth noting that without a daily load, muscles will atrophy with time, but it is also not recommended to overload them.