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posterior femoral cutaneous nerve

(Science: anatomy, nerve) arises from the first three sacral nerves, supplies the skin of the posterior surface of the thigh and of the popliteal region (S1 and S2 component); it gives off a perineal branch (S3 component) that passes to the lateral aspect of the scrotum or labia majora.

Synonym: nervus cutaneus femoris posterior, posterior cutaneous nerve of thigh, small sciatic nerve.