Bones of the lower limb Colloquially, the lower limbs are the legs. However, in anatomy the term leg has a more precise meaning and corresponds to the calf, that is, the portion of the lower limb located between the knee and the ankle. Ball joint Colloquially called kneecap (whose accepted medical terminology is "patela") is a bone of the leg, the sesamoid (being wrapped by the distal tendon of the quadriceps crural) being the largest in the human body. It is in even number and is a constant bone. Function Among its main functions are: Acts as a support point by increasing the lever arm of the quadriceps. It guides the forces between the femoral component of the quadriceps and the patellar tendon. It protects the deep anatomy of the knee and the quadriceps tendon from friction forces. Tibia The tibia is a long, triangular prism shaped bone, located in the anterior and inner part of the l