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Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 6: Pelvis, Perineum, Hip, and Upper Thigh

Atlas of Human Anatomy in Cross Section: Section 6. Pelvis, Perineum, Hip, and Upper Thigh

Plate 6.31

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed

Plate 6.31

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Pyramidalis m.
2. Urethra
3. Vagina
4. Femoral a. and v.
5. Femoral nerve, terminal muscular brs.
6. Medial circumflex femoral a.
7. Obturator externus m.
8. Femoral neck

9. Levator ani m.
10. Uterovaginal plexus of vv.
11. Sciatic nerve
12. Posterior (femoral) cutaneous nerve (of thigh)
13. Ischial tuberosity
14. Gluteus maximus m.
15. Pudendal canal with nerves and vessels
16. Ischiorectal fossa
17. Internal anal sphincter
18. Anococcygeal ligament
19. Inferior pelvic diaphragmatic fascia and anus

20. Anal crease
21. Ischiorectal fossa and levator ani m.
22. Pudendal canal with pudendal nerve, and internal pudendal a. and v.
23. Sacrotuberous ligament and ischiorectal fossa
24. Tendon m. obturator internus
25. Obturator internus m.
26. Tendon m. biceps femoris
27. Quadratus femoris m.
28. Trochanteric bursa and greater trochanter of femur
29. Obturator membrane
30. Gluteus maximus m.

31. Vastus lateralis m.
32. Medial circumflex femoral a. and v.
33. Tensor fascia lata m.
34. Iliopsoas m.
35. Rectus femoris m.
36. Arcus tendineus
37. Sartorius m.
38. Pectineus m.
39. Superficial epigastric a.
40. Obturator externus m.
41. Ligamentum teres (round ligament) of uterus
42. Adductor longus m.
43. Mons pubis
44. Arcuate ligament
45. Tendon mm. rectus abdominis
46. Pubic symphysis

This section passes through the pubic symphysis (46), urethra (2), vagina (3), anus (19), anal crease (20), and the femora (8, 28).

The levator ani muscles (9, 21) arise from the obturator fascia at the arcus tendineus (36).

Obturator internus muscle lies on the obturator membrane. It is covered by obturator fascia that is attached to the body of the pubis, the iliac portion of the terminal line, the ventral margin of the greater sciatic notch, the ischial spine, the sacrotuberous ligament and the falciform process of that ligament, and the ischial and pubic rami. Near the upper end of the obturator foremen the fascia is reflected over the obturator muscle and is attached to the obturator membrane. The upper part of the fascia is thickened near its middle part and forms a tendinous arch (36) for the attachment of the levator ani muscle (9, 21). Below the arch, the fascia forms the lateral boundary of the ischiorectal fossa (16, 21) and forms the pudendal canal (15, 22).

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