The natural ostium of the sphenoid sinus is located in which part of the nasal cavity?

• A Hiatus semilunaris of the middle meatus
• B Sphenoethmoidal recess, medial to the superior turbinate ✓
• C Inferior meatus, adjacent to the nasolacrimal duct opening
• D Roofof the posterior choana, near the eustachian tube cushion

Explanation

The sphenoid ostium lies in the sphenoethmoidal recess between the superior turbinate and the nasal septum, roughly 1.5 cm above the posterior choana. Endoscopic transsphenoidal surgery enters through this recess after medialising the middle turbinate. The hiatus semilunaris receives maxillary and anterior ethmoid drainage, which kills distractor A.

Reference: Dhingra, Diseases of Ear, Nose and Throat, 8th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.