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Leg, in anatomy, one of the paired limbs of a vertebrate, used chiefly for supporting the body and for locomotion. The term leg is sometimes applied to one of the paired appendages of an insect, spider, or other arthropod. In humans, the leg extends from the hipbone to the foot. The upper part of the human leg, the thigh, is supported by the femur-the longest and strongest bone of the body. The upper end of …

…leg provide balance and bend the foot up and to the side. The femoral artery, deep in the thigh, is the major vessel that supplies blood to the thigh, while the anterior and posterior tibial arteries are primary blood vessels in the lower leg. The major nerve in the leg is the sciatic nerve -the largest nerve in the body, which carries motor information to and sensory information from most of the leg and foot.