Median sacral crest
Crista sacralis mediana
Definition
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.
References
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 http://www.bartleby.com/107/).