Sacrum

Sacrum
- Base of sacrum
  - Promontory
  - Ala of sacrum
  - Superior articular process of sacrum
- Lateral part of sacrum
  - Auricular surface of sacrum
  - Sacral tuberosity
- Pelvic surface of sacrum
  - Transverse ridges
  - Intervertebral foramina
  - Anterior sacral foramina
- Dorsal surface of sacrum
  - Median sacral crest
  - Posterior sacral foramina
  - Intermediate sacral crest
  - Lateral sacral crest
  - Sacral horn
  - Sacral canal
    - Sacral hiatus
- Apex of sacrum