Question

The most anterior ridge of the sacrum is the

A) median sacral crest.
B) sacral promontory.
C) sacral hiatus.
D) third dorsal sacral foramen.

Answer 1

The most anterior ridge of the sacrum is the sacral promontory, which is not to be confused with the median sacral crest, sacral hiatus, or the third dorsal sacral foramen.

Step-by-step explanation:

The most anterior ridge of the sacrum is called the sacral promontory. This is the anterior lip of the superior base of the sacrum. In contrast, the median sacral crest is an irregular ridge running down the midline on the posterior side of the sacrum,

formed from the fusion of spinous processes of the sacral vertebrae. The sacral hiatus is not a ridge but an inferior opening and termination of the sacral canal. Lastly, the third dorsal sacral foramen is an opening for nerve exit situated on the posterior aspect of the sacrum, and not an anterior ridge.