Lateral sacral crest
Encyclopedia
On the lateral side of the posterior sacral foramina
Posterior sacral foramina
Lateral to the articular processes of the sacrum are the four posterior sacral foramina ; they are smaller in size and less regular in form than the anterior, and transmit the posterior divisions of the sacral nerves....

 is a series of tubercles, which represent the transverse processes of the sacral vertebrae, and form the lateral sacral crest.
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