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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 6.30

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


Plate 6.30

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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