This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Anatomy
What is nerve supply of stapedius? 
Select and explain. 
A. Facial nerve, B. Trigeminal nerve, C. Glossopharyngeal nerve, D. Abducens
A: Facial nerve
Answer: A: Facial nerve 
Explanation: Ans. is 'a' i.e., Facial nerve Tympanic cavity has two muscles :MuscleOriginInsertionInnervationFunctionTensor tympaniCartilagenous pharyngo tympanic tube, greater wing of sphenoid, its own bony canalUpper part of handle of malleusMandibular nerve (V3)Contraction pulls handle of malleus medially, tensing tympanic membrane to reduce the force of vibrations in response to loud noiseStapediusAttached to inside of pyramidal eminenceNeck of stapesBranch of facial nerveContraction, usually in response to loud noises, pulls the stapes posteriorly & prevents excessive osscillation