| 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 |
