Muscle of Perineum

Muscle: Ischiocavernosus

Origin: Internal surface of ischiopubic ramus and ischial tuberosity

Course and Distribution: Embraces crus of penis or clitoris, inserting onto inferior and medial aspects of crus and to perineal membrane medial to crus

Innervation: Muscular (deep) branch of perineal nerve, a branch of pudendal nerve (S₂-S₄)

Main Action(s): Maintains erection of penis or clitoris by compressing outflow veins and pushing blood from the root of penis or clitoris into the body of penis or clitoris