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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 6.4

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 6.4

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Peritoneal cavity
2. Ileum
3. Inferior epigastric a. and v.
4. Terminal ileum
5. Ascending colon
6. Ureter
7. Genital br., genitofemoral nerve, and testicular a. and v.
8. Femoral br., genitofemoral nerve
9. External abdominal oblique m.
10. Internal abdominal oblique m.
11. Transversus abdominis m.
12. Anterior superior spine of ilium
13. External and internal iliac aa.
14. Lateral (femoral) cutaneous nerve (of the thigh) Femoral nerve

16. Accessory obturator nerve
17. Obturator nerve and common iliac at junction with internal iliac vein
18. Iliolumbar v.
19. Fourth lumbar nerve
20. Gluteal fascia
21. Sacroiliac joint
22. Gluteus maximus m., tendinous origin
23. Sacrum
24. Posterior sacroiliac ligament
25. Anterior sacral foramen
26. Multifidus and iliocostalis lumborum mm.
27. Third sacral nerve
28. Intervertebral fibrocartilage and anterior longitudinal ligament

29. Second sacral nerve
30. Vertebra, L5
31. First sacral nerve
32. Median sacral and superior rectal aa.
33. Fourth lumbar nerve
34. Gluteus maximus m.
35. Femoral v. and obturator nerve
36. Gluteus medius m.
37. Anterior sacroiliac ligament
38. Accessory obturator nerve
39. Gluteus minimus m.
40. Femoral nerve
41. Iliacus m.

42. Psoas major m. and lateral (femoral) cutaneous nerve (of the thigh)
43. Os ilium
44. External and internal iliac aa.
45. Sigmoid colon
46. Genitofemoral nerve
47. External abdominal oblique m.
48. Internal abdominal oblique m.
49. Transversus abdominis m.
50. Ureter
51. Transversalis fascia
52. Semilunar line
53. Colon
54. Rectus abdominis m.
55. Rectus (abdominis) sheath
56. Median umbilical ligament

This section is through the sacral promontory and the inferior surface of the L5/S1 intervertebral disk (28). The sacroiliac joint (21) is seen. The anterior sacral foremen (25) is found at this level with the first sacral nerve (31). This cut is at the level of the sacral promontory (23), hence the following sections will be through the true pelvis.

The division of the left common iliac artery is completed and the external and internal

(13, 44) arteries are seen at this level.

The external oblique muscle (9, 47) appears for the last time.

The fourth lumbar (19) or furcal nerve appears at this level. The furcal nerve divide and contributes to both the lumbar and sacral plexuses of nerves.

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