Sacral hiatus
Hiatus sacralis
Definition
The sacral hiatus is the inferior end of the sacral canal at the level of S3-S4 on the dorsal surface, where filum terminale emerges.
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/).
