Pterygoid bone

Thepterygoidis a paired bone forming part of the palate of manyvertebrates,behind thepalatine bones.

Skull diagram ofChampsosaurus,showing the pterygoid bone in red-violet (visible in inferior view at lower right and posterior to the ectopterygoid bone in lateral view at top)

It is a flat and thin lamina, united to the medial side of thepterygoid process of the sphenoidbone, and to the perpendicular lamina of the palatine bone.