Auditory brainstem response (ABR) wave I, III, and V originate from which anatomical sites respectively?

• A Cochlea — inferior colliculus — medial geniculate body
• B Eighth nerve (cochlear end) — cochlear nucleus — lateral lemniscus/inferior colliculus (pontomedullary junction level) ✓
• C Spiral ganglion — superior olivary complex — inferior colliculus
• D Hair cells — cochlear nucleus — superior olivary complex

Explanation

ABR waves correspond to successive neural generators along the ascending auditory pathway: Wave I — distal portion of the eighth (cochlear) nerve/cochlea; Wave II — proximal eighth nerve/cochlear nucleus; Wave III — cochlear nucleus/superior olivary complex; Wave IV — nuclei of lateral lemniscus; Wave V — inferior colliculus (or lateral lemniscus near the inferior colliculus). Wave V is the most clinically important, used for threshold estimation and interaural latency differences. In acoustic neuroma, Wave V is delayed on the affected side.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.