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Leg (lower free coning, lat. Mémbrum inférius liberum) is a paired organ of support and movement of a person.
The phylogenetic human leg is derived from the hind limbs of amphibians, which, in turn, are descended from the fins of fish.
The leg anatomically consists of three main parts: the thigh, tibia and foot. The femur is formed by the femur (the most massive and strongest of human bones) and the patella protecting the knee joint. The patella provides a block when the leg is extended. The shin is formed by the large and small shin bones. The foot forms many small bones. The place where the femur joins the pelvic bone is called the hip joint. The articulation of the femoral and tibial bones is called the knee joint. The tibial bones with the bones of the foot are called the ankle joint. The Achilles tendon restricts movement of the foot relative to the tibia. Injuries to the ankle and especially the knee joint are dangerous, as they often cause irreversible harm.
The hip, knee and ankle joints consist of an articular sac filled with synovial fluid that plays the role of a lubricant. Articular bag hermetically closes the joint. Due to this, the joint is held including air pressure. The ends of the bones are covered with hyaline cartilage, which reduces friction. The meniscus in the knee joint absorbs shocks when running and jumping. The meniscus is not a bone and is not able to grow together. When the meniscus ruptures, its fragments are removed.
