At the apex of the cochlea, the scala vestibuli communicates with the scala tympani through which opening?
- A Habenula perforata
- B Cochlear aqueduct
- C Helicotrema ✓
- D Aqueduct of the vestibule
Correct answer: C. Helicotrema
Explanation
The helicotrema is the communication between the scala vestibuli and scala tympani at the apex of the cochlea, permitting perilymph displaced by stapes movement at the oval window to flow across and dissipate at the round window. The scala media ends blindly at the apex and does not take part in this continuity. The cochlear aqueduct connects perilymph to the subarachnoid space, not the two scala together.
Reference: Gray's Anatomy, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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