The endolymphatic sac is responsible for which primary function in the inner ear?

• A Endolymph production via active ion transport
• B Conversion of mechanical to electrical energy in hair cells
• C Maintenance of potassium gradient via stria vascularis
• D Endolymph resorption and immunologic defense ✓

Explanation

The endolymphatic sac is the primary site of endolymph resorption and also serves immunologic functions. Endolymph is produced mainly by the stria vascularis (responsible for the high K+ concentration). The endolymphatic sac reabsorbs endolymph; obstruction or dysfunction of this resorption leads to endolymphatic hydrops — the pathophysiological basis of Meniere's disease.

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.