The petrosal process is a sharp process below the notch for the passage of the abducent nerve on either side of the dorsum sellae of the sphenoid bone. It articulates with the apex of the petrous portion of the temporal bone, and forms the medial boundary of the foramen lacerum.
References
This article incorporates text in the public domain from page 147 of the 20th edition of Gray's Anatomy (1918)
