The perineal raphe is a visible line or ridge of tissue on the body that extends from the anus through the perineum to the scrotum (male) or the vulva (female).
It is found in both males and females, arises from the fusion of the urogenital folds, and is visible running medial through anteroposterior, to the anus where it resolves in a small knot of skin of varying size.
It is the result of a fetal developmental phenomenon whereby the scrotum and penis close toward the midline and fuse.
[1] This article incorporates text in the public domain from page 1237 of the 20th edition of Gray's Anatomy (1918)
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