Lower body anatomy. Computer artwork showing the bones (cream), muscles (pink), nerves (yellow) and ligaments and tendons (white) of the lower body. At top attached to the lower spine is the psoas major muscle of the hip. The buttock consists of three muscles, the gluteus minimus, medius and maximus. The muscles at the back of the thigh are the hamstring muscles. In the calf are the gastrocnemius and soleus muscles, collectively known as the triceps surae. The large nerve running from the sacrum (triangular bone at base of spine) down the thigh is the sciatic nerve, the widest and longest nerve in the human body.
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