n :  any of several crests or tubercles on the sacrum: as  a  :  one on the midline of the dorsal surface - called also median sacral crest   b  :  any of a series of tubercles on each side of the dorsal surface lateral to the sacral foramina that represent the transverse processes of the sacral vertebrae and serve as attachments for ligaments - called also lateral crest , ateral sacral crest  .
 
 
 
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