stapedius muscle


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sta·pe·di·us mus·cle

(stā-pē'dē-ŭs mŭs'ĕl)
Origin, internal walls of pyramidal eminence in tympanic cavity; insertion, neck of the stapes; action, dampens vibration of stapes by drawing head of stapes backward as a result of a protective reflex stimulated by loud noise; nerve supply, facial.
Synonym(s): musculus stapedius [TA] .

stapedius muscle

Middle ear muscle. Origin: posterior wall of middle ear. Insertion: neck of stapes. Nerve: facial (CN VII). Action: tilts stapes, dampens excessive vibrations.
See also: muscle
References in periodicals archive ?
(6) The symptoms and signs of facial nerve palsy are due to the fact that the facial nerve carries not only motor fibres to stapedius muscle, but also autonomic innervation to lacrimal gland, submandibular gland and taste to anterior two-thirds of tongue via chorda tympani.
We know little about the etiology of hyperacusis other than that it involves a direct malfunction of the facial nerve; as a result, the stapedius muscle is unable to dampen sound.
One of these sites is anterior to the apical otic ossification Centre, while the other abuts the canalicular ossification center, near stapedius muscle. [7] The aim of this study is to evaluate the incidence and the location of the dehiscent facial canal in patients operated for facial paralysis, tympanoplasty with canal down or canal up mastoidectomy, stapedotomy, middle ear exploration for sudden hearing loss, and excluding middle ear tumour.