Posterior cutaneous nerve of thigh
It supplies the skin of the posterior surface of the thigh, leg, buttock, and also the perineum.[citation needed] It then descends deep to the gluteus maximus muscle, medial or posterior to the sciatic nerve,[2] and alongside the inferior gluteal artery.[citation needed] Its branches are all cutaneous, and are distributed to the gluteal region, the perineum, and the back of the thigh and leg.The posterior cutaneous nerve of the thigh provides sensory innervation to most of[2] the posterior surface of the thigh (upper leg),[2][1] and the superior[1] part of the posterior surface of the leg (lower leg),[2][1] as well as (the inferior part of) the gluteal region (via inferior cluneal nerves, derived from anterior rami of S1-S2), and the perineum (via the perineal branch).[3] This article incorporates text in the public domain from page 959 of the 20th edition of Gray's Anatomy (1918)