The endolymphatic duct passes through which bony canal connecting the membranous labyrinth to the endolymphatic sac?
- A Cochlear aqueduct
- B Vestibular aqueduct (endolymphatic aqueduct) ✓
- C Singular canal
- D Internal auditory canal
Correct answer: B. Vestibular aqueduct (endolymphatic aqueduct)
Explanation
The vestibular aqueduct (endolymphatic aqueduct) is a narrow bony canal in the petrous temporal bone that contains the endolymphatic duct, connecting the membranous labyrinth (utricle and saccule via the utriculosaccular duct) to the endolymphatic sac on the posterior surface of the petrous bone. Its enlargement (LVAS - large vestibular aqueduct syndrome) is associated with progressive SNHL. The cochlear aqueduct connects the perilymphatic space to the CSF.
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.