Posterior femoral cutaneous nerve

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The posterior femoral cutaneous nerve, also known as the posterior cutaneous nerve of the thigh, is a sensory branch of the sacral plexus. It arises from the posterior rami of spinal nerves S1 and S2 and anterior rami of spinal nerves S2 and S3. It exits the pelvic cavity through the greater sciatic foramen, running deep to the gluteus maximus and continuing inferiorly through the posterior thigh where it courses superficial to the long head of the biceps femoris. It eventually pierces the deep fascia at the popliteal region and terminates at around the mid-calf region.

The posterior femoral cutaneous nerve gives rise to several cutaneous branches which innervate the perineum, gluteal region, posterior thigh as well as the proximal part of the posterior leg.