Petrooccipital fissure - Fissura petrooccipitalis
The grooved surface of the foramen magnum is separated on either side from the petrous portion of the temporal bone by the petro-occipital fissure, which is occupied in the fresh state by a plate of cartilage; the petro-occipital fissure is continuous behind with the jugular foramen, and its margins are grooved for the inferior petrosal sinus.
This definition incorporates text from the wikipedia website - Wikipedia: The free encyclopedia. (2004, July 22). FL: Wikimedia Foundation, Inc. Retrieved August 10, 2004, from http://www.wikipedia.org
General Anatomy > Bones; Skeletal system > Axial skeleton > Cranium > Cranial base > Internal surface of cranial base > Petrooccipital fissure