Your sciatic nerve is the longest and widest in the human body. It starts in your lower back near the base of your spine and branches run through your buttocks and down each leg. This important nerve supplies almost all the skin of the leg, muscles of the back of your thigh and leg and foot.
As it weaves it’s way through your lower anatomy, it actually passes just under your piriformis muscle and through an opening in your pelvis. When it reaches the leg, it travels down the back of your leg, behind the adductor magnus muscle and ends at your foot.