Male external genitalia and perineum

Nerve supply to bulbospongiosus muscle

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Image #166-7
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Male external genitalia and perineum
Nerve supply to bulbospongiosus muscle
The left bulbospongiosus muscle (2) has been dissected to expose branches of the perineal nerve (13) which ramify within the muscle. In addition, another branch of the perineal nerve (3) passes through the posterior part of the muscle near the midline and emerges superficially to send filaments to join the posterior scrotal nerves shown in earlier photographs.
1 . Corpus spongiosum of penis
2 . Bulbospongiosus muscle (pointer on midline raphe of muscle)
3 . Branch of perineal nerve coursing through bulbospongiosus to join posterior scrotal nerves peripherally (see text above)
4 . Central tendon of perineum
5 . Perineal artery
6 . Posterior part of superficial perineal fascia
7 . Anus
8 . Levator ani muscle
9 . Inferior rectal nerve
10 . Internal pudendal artery
11 . Lunate fascia forming medial wall of pudendal canal
12 . Ischiocavernosus muscle
13 . Branches of perineal nerve passing to bulbospongiosus muscle
14 . Posterior scrotal nerves
15 . Ischial tuberosity