An unusual bifurcation of sciatic nerve deep to Piriformis: Case report with review of literature

Sciatic nerve, the thickest nerve in the body, is formed in the pelvis from the sacral plexus. It is comprised of both anterior and posterior divisions of fourth lumbar to third sacral spinal nerves [1]. Having left the pelvis through the greater sciatic foramen, it courses beneath the piriformis and enters the gluteal region. Then it travels over the gamelli, obturator internus and quadratus femoris and descends vertically midway between greater trochanter and ischial tuberosity [1].