Perineal raphe

The perineal raphe is a visible line or ridge of tissue on the male human body that extends from the anus through theperineum.

This structure continues through the midline of the scrotum (scrotal raphe) and upwards through the posterior midline aspect of the penis (penile raphe). It is the result of a fetal developmental phenomenon whereby the scrotum and penis close toward the midline and fuse.