Ischiocavernosus muscle is a muscle of perineum that lies just below the perineal surface and is found in both males and females.
Origin and Insertion:
In males, the ischiocavernosus covers the crus penis and is attached to the ischial tuberosity and ischial ramus of respective side by both muscular and tendinous fibers. These fibers then form an aponeurosis that is attached to the sides and under-surface of crus penis.
In females, the muscle is related to a much smaller crus clitoris, and has a correspondingly smaller attachment to the ischiopubic ramus. Other than the size, the muscle is similar in characters to the male muscle.
The ischiocavernosus muscle is innervated by the deep (muscular) branch of the perineal nerve, which in turn is a branch of the pudendal nerve.
In males, the muscle compresses the crus penis and helps to maintain penile erection and to stabilize the erect penis. In females, it may help to promote clitoral erection.