Which structure serves as the medial anchoring point of the tectorial membrane within the cochlear duct?
- A Spiral limbus ✓
- B Stria vascularis
- C Spiral prominence
- D Outer hair cells of Deiters
Correct answer: A. Spiral limbus
Explanation
The tectorial membrane arises from the vestibular lip of the spiral limbus, a periosteal ridge on the upper surface of the osseous spiral lamina, and extends laterally over the organ of Corti. Its lateral edge contacts the tallest row of outer hair cell stereocilia while remaining free over the inner hair cells. The stria vascularis and spiral prominence form part of the lateral cochlear wall and have no role in suspending the tectorial membrane.
Reference: Gray's Anatomy, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.