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Male external genitalia and perineum

Nerve supply to ischiocavernosus muscle

Image #166-6

KEYWORDS: Muscles and tendons, Perineum, Peripheral nervous system, Vasculature.

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Male external genitalia and perineum

Nerve supply to ischiocavernosus muscle

The ischiocavernosus muscle has been divided posteriorly and spread apart to expose branches of the perineal nerve that supply the muscle. One of these branches terminates in the posterior part of the muscle whereas another branch passes forward to the anterior part of the muscle belly. Posterior scrotal branches of the perineal nerve have been displaced laterally and medially to display the motor branch (21).

1 .	Deep perineal fascia (Buck's fascia)
2 .	Bulbospongiosus muscle
3 .	Ramus of ischium (area indicated by lower pointer covered by periosteum)
4 .	Crus of penis
5 .	Ischiocavernosus muscle
6 .	Perineal artery
7 .	Transverse perineal artery
8 .	Posterior scrotal nerve
9 .	Posterior part of superficial perineal fascia
10 .	Lunate fascia within ischiorectal fossa
11 .	External anal sphincter muscle
12 .	Branches of perineal nerve (spread to reveal nerve to Ischiocavernosus muscle)
13 .	Levator ani muscle
14 .	Corpus spongiosum of penis
15 .	Superficial perineal fascia (reflected)
16 .	Crus of penis
17 .	Nerve to anterior part of Ischiocavernosus muscle
18 .	Ischiocavernosus muscle (dissected)
19 .	Ramus of ischium
20 .	Nerve to posterior part of Ischiocavernosus muscle
21 .	Perineal nerve (branch to ischiocavernosus)
22 .	Internal pudendal artery and vein