All of the following canals open on the posterior
wall of the pterygo palatine fossa EXCEPT
Pterygopalatine Fossa:

This is a small pyramidal space situated deeply, below the apex of orbit.

Communications:

Anteriorly : With orbit through inferior orbital fissure.
Posteriorly :
	
With middle cranial fossa through foramen rotundum.
With foramen lacerum through pterygoid canal.
With pharynx through palatinovaginal canal.


Medially : With nose through sphenopalatine foramen.
Laterally : With infratemporal fossa through pterygomaxillary fissure.
Inferiorly : With oral cavity through greater & lesser palatine canals.
Greater palatine canal
Foramen Rotundum
Pterygoid canal
Palatovaginal canal