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Sciatica occurs when there is pressure or damage to the sciatic nerve. This nerve starts in the lower back and runs down the back of each leg. This nerve controls the muscles of the back of the knee and lower leg. It also provides sensation to the back of the thigh, part of the lower leg, and the sole of the foot.
Anatomy of Sciatica. The sciatic nerve runs from the lower back, down through the hips and buttocks, and along the back of the leg into the foot. It actually originates from the L4 through S3 spinal nerves. It innervates the deep muscles of the buttocks and hips.ciatica is a name given to pain caused by pressure placed on the sciatic nerve. When a nerve is placed under pressure it sends out pain signals. It may radiate down the length of the nerve or be focused in a specific area. The muscles innervated by the nerve may or may not be directly affected.