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Encyclopedia > Stapes
Bone: Stapes
A. Left stapes. B. Base of stapes, medial surface.
Chain of ossicles and their ligaments, seen from the front in a vertical, transverse section of the tympanum.
Bones and muscles in the tympanic cavity in the middle ear
Gray's subject #231 1045
Precursor 2nd branchial arch[1]
MeSH Stapes

The stapes or stirrup is the stirrup-shaped small bone or ossicle in the middle ear which attaches the incus to the fenestra ovalis, the "oval window" which is adjacent to the vestibule of the inner ear. It is the smallest and lightest bone in the human body. Image File history File links Gray918. ... Image File history File links Gray919. ... The ossicles (also called auditory ossicles) are the three smallest bones in the human body. ... The tympanic membrane, colloquially known as the eardrum, is a thin membrane that separates the external ear from the middle ear. ... Image File history File links No higher resolution available. ... The malleus is hammer-shaped small bone or ossicle of the middle ear which connects with the incus and is attached to the inner surface of the eardrum. ... The tensor tympani muscle arises from the auditory tube and inserts onto the handle of the malleus, damping down vibration in the ossicles and so reducing the amplitude of sounds. ... This article refers to a bone in the mammalian ear. ... The stapedius is the smallest striated muscle in the human body. ... For more uses of the word labyrinth, see Labyrinth (disambiguation) The labyrinth is a system of fluid passages in the inner ear, including both the cochlea which is part of the auditory system, and the vestibular system which provides the sense of balance. ... The ear canal (external auditory meatus, external acoustic meatus), is a tube running from the outer ear to the middle ear. ... The tympanum or tympanic membrane, colloquially known as eardrum, is a thin membrane that separates the outer ear from the middle ear. ... The Eustachian tube (or auditory tube) is a tube that links the pharynx to the middle ear. ... The tympanic cavity is a small cavity surrounding the bones of the inner ear. ... In the development of vertebrate animals, the branchial arches (or pharyngeal arches) develop during the fourth and fifth week in utero as a series of mesodermal outpouchings on the left and right sides of the developing pharynx. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... This article is about the skeletal organs. ... The ossicles (also called auditory ossicles) are the three smallest bones in the human body. ... The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the cochlea. ... This article refers to a bone in the mammalian ear. ... The fenestra ovalis or oval window is a membrane-covered opening which leads from the middle ear to the vestibule of the inner ear. ... This is a page about the part of the ear. ... For other uses, see Ear (disambiguation). ... Physical Features of the Human Body The human body is the entire physical structure of a human organism. ...


The stapes transmits the sound vibrations from the incus to the membrane of the inner ear inside the fenestra ovalis. The fenestra ovalis or oval window is a membrane-covered opening which leads from the middle ear to the vestibule of the inner ear. ...


In non-mammalian vertebrates, the bone homologous to the stapes is usually called the columella; however, in reptiles, either term may be used. This article does not cite any references or sources. ... In biology, homology is any similarity between structures that is due to their shared ancestry. ... Reptilia redirects here. ...


See also

This article is about the skeletal organs. ... In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ...

References

  1. ^ Embryology at UNC hednk-023
  • Vallejo-Valdezate LA, Martín-Gil J, José-Yacamán M, Martín-Gil FJ, Gil-Carcedo LM. "Scanning electron microscopy images and energy-dispersive X-ray microanalysis of the stapes in otosclerosis and van der Hoeve syndrome". Laryngoscope. 2000 Sep;110(9):1505-10.

The University of North Carolina at Chapel Hill is a public, coeducational, research university located in Chapel Hill, North Carolina, United States. ...

External links


  Results from FactBites:
 
1999; Three-dimensional vibration of the stapes in the cat middle ear (333 words)
Under this concept the motions of malleus and stapes are one-dimensional.
The motion of the stapes has been difficult to measure in the past because access is limited and only a small portion of the crura can be seen.
To determine its 3D motion, the vibration of the stapes was measured with a confocal heterodyne interferometer at three points from different viewing angles.
Ruhr-Universität Bochum (0 words)
In all the animations the motions of the ossicles are represented normalized to the upward/downward motion of the stapes.
At 5,000 Hz the stapes displacement is about 0.23 nm for a 1 Pa stimulation at the eardrum, compared to 17 nm at 100 Hz.
In the case of a stimulation perpendicular to the stapes footplate - which is given here - the relative motion is quantity, that governs the perception of hearing: it is the motion of the footplate relative to the surrounding oval window.
  More results at FactBites »

 
 

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