Tensor tympani

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Tensor tympani
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The right membrana tympani with the hammer and the chorda tympani, viewed from within, from behind, and from above.
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The medial wall and part of the posterior and anterior walls of the right tympanic cavity, lateral view. (Label for "Tensor tympani muscle" is at right, second from bottom.)
Bones and muscles in the tympanic cavity in the middle ear
Latin musculus tensor tympani
Gray's subject #231 1046
Origin auditory tube
Insertion    handle of the malleus
Artery: superior tympanic artery
Nerve: medial pterygoid nerve from the mandibular nerve (V)
Action: tensing the tympanic membrane
Dorlands
/Elsevier
m_22/12551096

The tensor tympani, the larger of the two muscles of the tympanic cavity, is contained in the bony canal above the osseous portion of the auditory tube, from which it is separated by the septum canalis musculotubarii.

Origin and insertion

It arises from the cartilaginous portion of the auditory tube and the adjoining part of the great wing of the sphenoid, as well as from the osseous canal in which it is contained.

Passing backward through the canal, it ends in a slender tendon which enters the tympanic cavity, makes a sharp bend around the extremity of the septum, and is inserted into the manubrium of the malleus, near its root.

Function

When tensed, the action of the muscle is to pull the malleus medially, tensing the tympanic membrane, damping vibration in the ear ossicles and thereby reducing the amplitude of sounds. This muscle is contracted primarily to dampen the noise produced by chewing. (Compare to the more general dampening function of the stapedius muscle.)

Innervation

Innervation of the muscle is from branches of the mandibular division of the trigeminal nerve (V), by way of the Otic ganglion.

Additional images

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

External links

de:Musculus tensor tympani hu:Musculus tensor tympanicus nl:Musculus tensor tympani sr:Мишић затезач бубне опне


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