**2.4 Pterygoid fossa**

Under the temporalis muscle, the superior head of the lateral pterygoid muscle (LPM) lies on and attaches to the infratemporal surface and infratemporal crest of the greater wing of the sphenoid bone, while the lower head attaches to the lateral surface of the lateral pterygoid plate (LPP). The origin of the Medial pterygoid muscle (MPM) can be seen between the LPP and medial pterygoid plate (MPP). Under the MPP, the wall of epipharynx can be found. The third segment of the internal maxillary artery is located in the pterygoid fossa. The maxillary artery branches into the descending palatine artery, the infraorbital artery, the artery of the pterygoid canal, the artery of the FR, and the sphenopalatine artery [21].
