Auditory Brainstem Response (ABR) Wave V corresponds to action potentials generated at which anatomical level?
- A Lateral lemniscus / inferior colliculus junction ✓
- B Cochlear nerve (distal CN VIII)
- C Cochlear nucleus
- D Superior olivary complex
Correct answer: A. Lateral lemniscus / inferior colliculus junction
Explanation
ABR wave V (the most robust and clinically important wave) originates from the lateral lemniscus and/or the inferior colliculus, representing the most rostral auditory brainstem relay. Wave I = distal CN VIII; Wave II = proximal CN VIII/cochlear nucleus; Wave III = superior olivary complex; Wave IV = lateral lemniscus; Wave V = inferior colliculus. Prolonged I–V interwave latency indicates retrocochlear pathology along this pathway.
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.