stapedius(redirected from Stapedus muscle)
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one of the muscles of the auditory ossicles; origin, internal walls of pyramidal eminence in tympanic cavity; insertion, neck of the stapes; action, dampens vibration of stapes by drawing the head of the stapes backward as a result of a protective reflex stimulated by loud noise; nerve supply, facial.
a small muscle on the wall of the tympanic cavity of the middle ear. It acts reflexively in response to loud sounds to reduce excessive vibrations that could injure the internal ear by pulling the head of the stapes posteriorly out of the oval window.
stapedius(stā-pē′dē-ŭs) [L. stapes, stirrup]
A small muscle of the middle ear inserted in the stapes.
innermost auditory ossicle; shaped like a stirrup.
a striated muscle which aids in the dampening of the effects of high-frequency vibrations on the auditory apparatus.