What is "pterygoid plexus"

n. a plexus of veins draining the region of the pterygoid muscles and draining into the internal maxillary and anterior facial veins

The pterygoid plexus (; from Greek pteryx, "wing" and eidos, "shape") is a venous plexus of considerable size, and is situated between the temporalis muscle and lateral pterygoid muscle, and partly between the two pterygoid muscles.