stapedius


Also found in: Dictionary, Encyclopedia, Wikipedia.

sta·pe·di·us (mus·cle)

[TA]
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.
Synonym(s): musculus stapedius [TA], stapedius

stapedius

[stəpē′dē·əs]
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.

stapedius

innermost auditory ossicle; shaped like a stirrup.

stapedius muscle
a striated muscle which aids in the dampening of the effects of high-frequency vibrations on the auditory apparatus.
References in periodicals archive ?
9) Hara et al operated on 4 patients spanning two generations of a Japanese family that exhibited fixation by a bony bar extending from the pyramidal process to the head of the stapes; in each case, there was a normal stapedius tendon but with a monopod stapes superstructure.
For instance, in the ear of the 3D body, surgeons can 'isolate' stapes, the smallest bone in the human body, and even stapedius, the smallest striated muscle measuring about one millimeter and view them from all directions.
The human body's smallest muscle is called the stapedius, and it's located in the ear.
The facial nerve gives off branches to the stapedius muscle and the chorda tympani prior to its extratemporal course.
We excluded tenosynovial extra-articular chondromatosis--another entity that has been reported as synovial chondromatosis originating in the tenosynovial membranes (10)--in view of the absence of any involvement of the stapedius and tensor tympani tendons.
This allows the surgeon to position the two short prongs, which accommodate the stapedius tendon.
We have been preserving the stapedius tendon when possible, (3) which makes the incus more stable during prosthesis insertion and may help maintain the blood supply to the incus.
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.
When the embryo is between 10 and 18 mm in length, the deep layer of the second mesenchymal lamina differentiates into the posterior digastric complex (the stapedius muscle, the posterior belly of the digastric muscle, the digastric tendon, and the stylohyoid muscle).
The primary sign of cochlear injury is a decrease in hearing threshold on audiometry, stapedius reflex testing, or otoacoustic emissions testing.
The stapedius tendon is intact, inferior to the stapes are the round window niche and round window membrane.