auditory ossicles


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Related to auditory ossicles: Eustachian tube, middle ear ossicles

au·di·to·ry os·si·cles

[TA]
the small bones of the middle ear; they are articulated to form a chain for the transmission of sound from the tympanic membrane to the oval window.

auditory ossicles

The 3 diminutive bones of the middle ear. The malleus is attached to the inner face of the tympanic membrane at the manubrium and articulates at its head with the body of the incus; the incus in turn articulates at its lenticular process with the head of the stapes; the stapes is attached at its base by a ligamentous ring to the oval window of the vestibule. Sound waves channelled though the external acoustic canal (auditory duct) to the tympanic membrane are amplified by the auditory ossicles.

The vibrations received at the oval window are passed down the cochlea; the relative movement of the basilar and tectorial membranes leads to deflection of the stereocilia of the hair cells in the organ of Corti, which generates an influx of K+ ions and production of electrical signals that travel via the cochlear nerve to the auditory complex.

au·di·to·ry os·si·cles

(aw'di-tōr-ē os'i-kĕlz) [TA]
The small bones of the middle ear; they are articulated to form a chain for the transmission of sound from the tympanic membrane to the oval window.
Synonym(s): ossicula auditus [TA] , ear bones.

auditory ossicles

The chain of three tiny bone in the middle ear which acts as an impedance transformer, efficiently coupling the relatively large low-impedance movement of the ear drum to the smaller, high-impedance movement of the fluid in the cochlea of the inner ear.

au·di·to·ry os·si·cles

(aw'di-tōr-ē os'i-kĕlz) [TA]
Small bones of middle ear articulated to form a chain for the transmission of sound from the tympanic membrane to the oval window.
Synonym(s): ear bones.
References in periodicals archive ?
Inner Vascular Structures of the Auditory Ossicles. With the novel microgrinding technique blood vessels can be found not only in the mucosa around the ossicular chain but also inside the ossicles.
[13] as well as Hassmann and Chodynicki [14] examined extracted single auditory ossicles by scanning electron microscopy.
Nevertheless, by using uncolored epoxy resin and ground resin and grinding in very thin layers we can follow the course of the internal vessels of the ossicles through the nutrition pores into the vascular network inside the "mesenteries" of the tympanic cavity as well as in the mucosa covering the auditory ossicles.
Oesterle [4] also found cartilage areas inside auditory ossicles and explained their existence by the remaining of cartilage deposits during the ossification process.
However, by analyzing the histological images of every section of the auditory ossicles in our specimen, we did not find any marrow spaces.
The appearance of marrow spaces and cartilage areas can be explained by the embryological development of the auditory ossicles. From the mesenchyme of the first branchial arch the head and neck of the malleus as well as the body of the incus descend.
But the generated 3D model of the [micro]CT examination of the separated auditory ossicles can only depict the calcified areas of the bones.
After reconstructing the auditory ossicles from histological images based on the microgrinding technique, similar volumes of the same ossicles can be estimated (i.e., malleus about 11800 [micro][m.sup.3], incus about 14910 [micro][m.sup.3], and stapes about 1660 [micro][m.sup.3]).
Also, in using untainted, not decalcified bone we were able to rebuild the network of unshrunkblood vessel inside the auditory ossicles and could distinguish cartilage areas and blood vessels.
Our study shows that the microgrinding method is necessary to get all anatomical characteristics of the human auditory ossicles. By comparing the histological images of the stained plane with a parallel look to the deeper zones of the specimen by using uncolored epoxy resin, the 3D reconstruction is possible in a very high resolution.
Winch, "Vascular channels in the auditory ossicles in man," Annals of Otology, Rhinology & Laryngology, vol.
Shoumura, "Scanning electron microscopic study of the human auditory ossicles," Annals of Anatomy, vol.