Parts
- The pelvic surface of the sacrum is concave from above downward, and slightly so from side to side.
- The dorsal surface of the sacrum is convex and narrower than the pelvic.
- The lateral surface of the sacrum is broad above, but narrowed into a thin edge below.
- The base of the sacrum, which is broad and expanded, is directed upward and forward.
- The apex (apex oss. sacri) is directed downward, and presents an oval facet for articulation with the coccyx.
- The vertebral canal (canalis sacralis; sacral canal) runs throughout the greater part of the bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminae and spinous processes. It lodges the sacral nerves, and its walls are perforated by the anterior and posterior sacral foramina through which these nerves pass out.
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