Regarding stapedial reflex, which of the following is true -
Stapedius muscle helps to dampen very loud sound and thus prevents noise trauma to the inner ear. It is supplied by VII nerve (facial nerve). Lesions of facial nerve lead to loss of stapedial reflex and hyperacusis or phonophobia i.e. intolerance to loud sounds.
For more details see chapter – physiology of hearing and assessment of hearing loss of the guide
NOTE:
Stapedial reflex = Acoustic reflex
It helps to enhance the sound conduction in middle ear
It is a protective reflex against loud sound
It helps in masking the sound waves
It is unilateral reflex