The stapedius muscle, which moves the stapes ossicle, is innervated by: (A) CN V, (B) CN XII, (C) CN III, (D) CN VII
Answer is D. 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