This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eye, Nose and Ear, Subject name: Anatomy
The stapedius muscle, which moves the stapes ossicle, is innervated by 
Select and explain. 
A. CN V, B. CN XII, C. CN III, D. CN VII
D: CN VII
Answer: D: CN VII 
Explanation: Stapedius muscle - derivative of 2nd phyrangel arch Supplied by Fcaial nerve (nerve to stapedius) which is also 2nd phyrangeal arch derivative Aery of 2nd phyrageal arch - stapedial aery Origin of stapedius- from pyramidal eminence and inseed into neck of stapes. Function- stapedial Reflex / Acoustic reflex- when loud sounds (above 90 db ) are perceived -stapedial muscle contracts -stapes pulled back