Male external genitalia and perineum

Deep perineal space (continued).

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Image #168-6

Male external genitalia and perineum

Deep perineal space (continued).

The bulbourethral gland has been excised and the muscles of the deep perineal space have been dissected to expose their nerve supply. The superior fascia of the urogenital diaphragm lies in the background of the dissected area.

1. Crus of penis (cut off)
2. Corpus spongiosum of penis
3. Spongy part of urethra (opened)
4. Junction of membranous and spongy parts of urethra
5. Bulb of penis
6. Bulbospongiosus muscle (cut along midline raphe)
7. Central tendon of perineum
8. Deep transverse perineal muscle (partially resected and elevated)
9. Perineal membrane (posterior border)
10. Deep transverse perineal muscle (portion that lay superior to bulbourethral gland)
11. Superficial transverse perineal muscle
12. Left pointer: Nerve to deep transverse perineal muscle and sphincter muscle of urethra Right pointer: Internal pudendal artery (cut off within deep compartment)
13. Dorsal nerve of the penis
14. Dorsal vein of the penis (note its passage between arcuate pubic ligament and transverse perineal ligament)
15. Pubic arcuate ligament
16. Transverse perineal ligament
17. Sphincter muscle of urethra (middle pointer indicates fibers encircling membranous part of urethra)
18. Upper pointer: Internal pudendal vein Lower pointer: Superior fascia of urogenital diaphragm
19. Ramus of ischium
20. Perineal artery
21. Levator ani muscle