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

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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

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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