Promontory
Promontorium
Definition
Promontory is anterior margin of the body of first sacral vertebra, forming the prominent sacrovertebral anglewhen articulated with the last lumbar vertebra.
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/).