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 6.30

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. Tendon m. rectus abdominis 2. Pudendal and vesical plexus of vv. 3. Pubic tubercle 4. Obturator externus m. 5. Pectineus m. 6. Femoral a. and v. 7. Sartorius m. 8. Femoral nerve brs. 9. Rectus femoris m. 10. Obturator membrane, obturator foramen 11. Iliopsoas m. 12. Tensor fascia lata m. 13. Gluteus medius m. 14. Obturator externus m. 15. Obturator internus m.	16. Levator ani m. 17. Sciatic nerve 18. Posterior (femoral) cutaneous nerve (of thigh) 19. Tendon m. biceps femoris 20. Ischial tuberosity 21. Gluteus maximus m. 22. Pudendal canal 23. Ischiorectal fossa 24. Rectum	25. Anal crease 26. Ischiorectal fossa and internal anal sphincter 27. Pudendal canal (Alcock) 28. Tendon m. obturator internus 29. Ischial tuberosity 30. Sciatic nerve 31. Tendon m. biceps femoris 32. Quadratus femoris m. 33. Femur, greater trochanter 34. Obturator internus m.	35. Gluteus medius m. 36. Femoral neck 37. Tendon m. gluteus minimus 38. Articular capsule, head of femur 39. Obturator externus m. 40. Tensor fascia lata m. 41. Lateral femoral circumflex a. and v. 42. Arcus tendineus, obturator fascia 43. Iliopsoas m. 44. Rectus femoris m. 45. Obturator membrane, obturator foramen 46. Femoral nerve brs. 47. Sartorius m. 48. Femoral a. and v. 49. Obturator a., v., and nerve 50. Uterovaginal plexus of vv. 51. Obturator externus m. 52. Pectineus m. 53. Pubic tubercle 54. Pubis 55. Vagina 56. Urethra 57. Interpubic disk, fibrocartilage

This section passes through the pubic symphysis (54, 57), obturator foramen (10, 45), ischial tuberosities (20, 29), urethra (56), vagina (55), and rectum (24).

The femoral nerve is breaking up into its muscular and cutaneous branches. The muscular supply includes, among others, the sartorius (7, 47), pectineus (5, 52), and rectus femoris (9, 44) muscles, which are seen at this level.

On the lateral sides of the vagina (55), the uterovaginal plexus of veins (50) and the pudendal and vesical plexus of veins (2) are seen. They drain into the internal iliac veins.

The obturator internus (15) and externus (14) muscles can be seen arising (in part) from opposite sides of the obturator foramen (10).

Note the tendons of the two rectus abdominis muscles (1) extending between the pubic tubercles (3, 53). Each muscle will insert on the superior ramus of the pubis, the ventral surface of the symphysis, and the linea alba.

The ischiorectal fossae (23, 26) containing fat are seen.

The pudendal canals (22, 27) contain the pudendal nerves, which divide within the canals into their terminal branches, the inferior rectal (hemorrhoidal) nerves, dorsal nerve of the clitoris, and pudendal nerve. In addition, the canals contain the internal pudendal artery and vein and their branches.

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