Pterygospinous process (Civinini process) is a sharp spine on the posterior edge of the lateral pterygoid plate of the sphenoid bone. The pterygospinous process is attached pterygospinous ligament which stretches towards the spine of the sphenoid.
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