In the middle line of dorsal surface of sacrum, it displays a crest, the median sacral crest (middle sacral crest), surmounted by three or four tubercles, the rudimentary spinous processes of the upper three or four sacral vertebræ.

This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from


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