This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Sphenopalatine foramen opens in which wall of pterygopalatine fossa? 
Select and explain. 
A. Medial wall, B. Lateral wall, C. Superior wall, D. Inferior wall
A: Medial wall
Answer: A: Medial wall 
Explanation: The pterygopalatine fossa is a small pyramidal space inferior to the apex of the orbitThe pterygopalatine fossa communicates to:DirectionPassageConnectionPosteriorlyforamen rotundummiddle cranial fossaPosteriorlypterygoid canal (Vidian)middle cranial fossa, foramen lacerumPosteriorlypalatovaginal canal (pharyngeal)nasal cavity/nasopharynxAnteriorlyinferior orbital fissureorbitMediallysphenopalatine foramennasal cavityLaterallypterygomaxillary fissureinfratemporal fossaInferiorlygreater palatine canal (pterygopalatine)oral cavity, lesser palatine canals