The vertebral canal
) runs throughout the greater part of the sacral
bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminæ 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.
- - "Sacrum, Median Sagittal Section"
- - "The Female Pelvis: Bones"