The scala vestibuli and scala tympani communicate at the:

• A Round window niche
• B Reissner's membrane apex
• C Helicotrema ✓
• D Spiral ligament attachment point

Explanation

The helicotrema is the small opening at the apex (cupula) of the cochlea where the scala vestibuli and scala tympani communicate, allowing slow equalisation of perilymphatic pressure. Reissner's membrane separates the scala vestibuli from the scala media (cochlear duct). The round window is the membrane at the base of the scala tympani, allowing movement of the basilar membrane. This anatomical detail is tested in the context of high-frequency versus low-frequency sound processing.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.