Head and Neck
All is true about stapes except (AIIMS Nov 2014)
|A||Derivative of 2nd pharyngeal arch|
|B||Covers the oval window|
|C||Controlled by stapedius to protect middle ear|
|D||Damage to stapedius produces hyperacusis|
The stapedius pulls out oval window from the fossa ovalis, if there is loud sound, and this protective move is called stapedial reflex. This prevents damage to the inner ear.
If stapedius is damaged, the patient suffers from hyperacusis, due to absence of stapedial reflex