Singular nerve is a
Superior vestibular nerve supplying posterior semicircular canal
Inferior vestibular nerve supplying posterior semicircular canal
Superior vestibular nerve supplying anterior semicircular canal
Interior vestibular nerve supplying anterior semicircular canal
A small subdivision of the vestibular nerve that carries information from the posterior semicircular canal to the brain. Singular neurectomy is a surgical procedure to divide the singular nerve, occasionally used in the treatment of benign paroxysmal positional veigo. Ref-Dhingraa textbook for ENT 6th edition.
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