In Auditory Brainstem Response (ABR) testing, which neural structure generates Wave V?

• A Distal cochlear nerve near the cochlea
• B Lateral lemniscus and inferior colliculus ✓
• C Cochlear nucleus (dorsal and ventral)
• D Superior olivary complex and trapezoid body

Explanation

ABR wave generators: Wave I = distal cochlear nerve; Wave II = proximal cochlear nerve at the brainstem entry zone; Wave III = cochlear nucleus; Wave IV = superior olivary complex and trapezoid body; Wave V = lateral lemniscus and inferior colliculus. Wave V is the most robust clinically. Prolonged I-V interpeak latency indicates retrocochlear pathology (e.g., acoustic neuroma causing slowed central conduction); prolonged interaural latency difference (ILD >0.4 ms) is the most sensitive ABR parameter for unilateral retrocochlear lesions.

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.