The tensor tympani muscle inserts into the medial surface of the handle of the malleus. Which nerve is responsible for its motor innervation?

• A Facial nerve (CN VII)
• B Medial pterygoid nerve (branch of CN V3) ✓
• C Chorda tympani (branch of CN VII)
• D Auriculotemporal nerve (branch of CN V3)

Explanation

The tensor tympani is innervated by the medial pterygoid nerve, a branch of V3 (mandibular nerve via otic ganglion). This is distinct from the stapedius muscle, which is innervated by the facial nerve. The tensor tympani pulls the malleus medially, tensing the tympanic membrane and reducing sound transmission during loud sounds — its reflex arc is distinct from the stapedius reflex.

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.