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Lane Medical Library

Bassett Collection of Stereoscopic Images of Human Anatomy

Ligaments and joints of lumbosacral spine and pelvic girdle

Sagittal section of lumbosacral spine; transverse section through sacroiliac joint

Image #215-6

KEYWORDS: Lumbar region, Muscles and tendons, Sacral region, Thoracic region, Vertebral column.

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Ligaments and joints of lumbosacral spine and pelvic girdle
Sagittal section of lumbosacral spine; transverse section through sacroiliac joint
The specimen shown in the preceding view (155-7) has been cut in the median plane and the right half subsequently has been cut in a plane transverse to the sacroiliac joint and approximately at right angles to the long axis of the sacrum. The sectioned parts have been separated from each other and are viewed from in front.
  1. Upper pointer: Intervertebral foramen Lower pointer: Posterior sacral foramen
  2. Interosseous sacroiliac ligament
  3. Sacroiliac joint (pointer on cavity and fibrocartilage covering articular surfaces of both bones)
  4. Body ilium (cut across)
  5. Anterior sacral (pelvic) foramina
  6. Greater sciatic foramen
  7. Body ischium
  8. Bony ridge at site of exit of tendon of obturator internus from pelvis (note other parallel ridges)
  9. Lesser sciatic foramen
  10. Ventral sacrococcygeal ligament
  11. Sacrococcygeal junction (articular cavity present in this specimen)
  12. Coccyx
  13. Sacrospinous ligament
  14. Ischial spine (pointer indicates facet for attachment of coccygeus muscle)
  15. Sacrotuberous ligament
  16. Supraspinous ligament
  17. Interspinous ligament
  18. Spinous process vertebra L. IV
  19. Arch of vertebra L. IV (facing vertebral canal)
  20. Ligamentum flavum
  21. Anulus fibrosus
  22. Body of vertebra L. V
  23. Anterior longitudinal ligament
  24. Nucleus pulposus
  25. Dura mater
  26. Promontory
  27. Lateral part sacrum
  28. Inferior limit of dural sac
  29. Sacroiliac joint (reinforced by ventral sacroiliac ligament)
  30. Transverse line sacrum (note remnant of intervertebral disk in cut section)
  31. Upper pointer: Sacral hiatus Lower pointer: Dorsal superficial sacrococcygeal ligament