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Bassett Collection of Stereoscopic Images of Human Anatomy

Male external genitalia and perineum

Nerve supply to bulbospongiosus muscle

Image #166-7

KEYWORDS: Muscles and tendons, Peripheral nervous system.

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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