Dissection of muscles of male perineum and pelvis diaphragm

Levator ani muscle viewed from below

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Image #174-6

Dissection of muscles of male perineum and pelvis diaphragm

Levator ani muscle viewed from below

The urogenital diaphragm has been entirely removed and the inferior fascia of the pelvic diaphragm has been cut away. Part of the obturator fascia (4) remains on the left side of the specimen. A gap in the levator ani muscle on the left side is bridged by fascia.

1. Pubic arcuate ligament
2. Upper pointer: Membranous part of urethra Lower pointer: Apex of prostate
3. Upper pointer: Medial margin of levator ani muscle Lower pointer: Prostatic fascia
4. Obturator fascia (partially removed)
5. Central tendon of perineum
6. Obturator internus muscle
7. Sacrotuberous ligament
8. External anal sphincter muscle
9. Anus
10. Anococcygeal ligament
11. Coccyx
12. Puboprostatic muscle
13. Body of pubic bone
14. Inferior pubic ramus
15. Obturator canal
16. Tendinous arch of levator ani muscle
17. Puborectalis muscle
18. Pubococcygeus muscle
19. Iliococcygeus muscle (17-19 are part of the levator ani muscle)
20. Posterior superior iliac spine (in background)