Lig. pterygospinale - Ligamentum pterygospinale
The pterygospinous ligament stretches from the upper part of the posterior border of the lateral pterygoid plate to the spinous process of the sphenoid. It occasionally ossifies, and in such cases, between its upper border and the base of the skull, a foramen is formed which transmits the branches of the mandibular nerve to the muscles of mastication.
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/).
Allgemeine Anatomie > Juncturae; Systema articulare > Juncturae cranii > Juncturae fibrosae cranii > Syndesmoses cranii > Lig. pterygospinale