Auditory Brainstem Response (ABR) is used to identify the hearing threshold by identifying Wave V. The neural generator of Wave V is located at the level of the:
- A Inferior colliculus of the midbrain ✓
- B Cochlear nerve (VIII nerve trunk)
- C Cochlear nucleus in the medulla
- D Medial geniculate body of the thalamus
Correct answer: A. Inferior colliculus of the midbrain
Explanation
ABR wave generators: Wave I = distal cochlear nerve (CN VIII); Wave II = cochlear nucleus (proximal CN VIII); Wave III = superior olivary complex (pons); Wave IV = lateral lemniscus (pons-midbrain junction); Wave V = inferior colliculus (midbrain). Wave V is the most robust and clinically important wave used for threshold estimation. The interpeak latencies (I-III, III-V, I-V) help localise retrocochlear pathology such as acoustic neuroma.
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.