C. External pterygoid process lying on the levator and tensor palati muscles.
"Surgical Anatomy" by Joseph Maclise
Both the lateral and posterior pterygoid processes are approximately 2.0 mm.
"A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas" by Theodore H. Eaton
Farther posteriorly the maxillary decreases in size, and the pterygoid and posterior maxillary process diverge medially from it.
"Cranial Osteiology of the Hylid Frog, Smilisca baudini" by Linda Trueb
Pt1, Pterygoid, anterior process.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 4" by Various