<prompt> Regarding stapedial reflex, which of the following is true -It helps to enhance the sound conduction in middle earIt is a protective reflex against loud soundIt helps in masking the sound wavesIt is unilateral reflex  <response>: 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 guideNOTE:Stapedial reflex Acoustic reflex 