Scala tympani

Encyclopedia : S : SC : SCA : Scala tympani

Interior of right osseous labyrinth. (Scala tympani labeled at right, inside cochlea. |- style="text-align: center;" class="hiddenStructure" | colspan="2" |
|- style="text-align: center; line-height: 1;" class="hiddenStructure" | colspan="2" |Cross section of the cochlea. (Scala tympani labeled at bottom, spelled as 'scala timpani'.) |- class="hiddenStructure" |Latin |colspan="2"| |- class="hiddenStructure" | |colspan="2"|[subject #232 ] |- class="hiddenStructure" |System |colspan="2"| |- class="hiddenStructure" |Precursor |colspan="2"| |- class="hiddenStructure" |MeSH |colspan="2"|[A09.246.631.246.848] |- class="hiddenStructure" |Dorlands/Elsevier |colspan="2"|[/] |} Scala tympani is the name of one of the perilymph filled cavities in the cochlear labyrinth. It is separated from the scala media by the basilar membrane, and it extends from the round window to the helicotrema, where it continues as scala vestibuli.
The purpose of the perilymph filled scala tympani and scala vestibuli is to transduce the movement of air that causes the tympanic membrane and the ossicles to vibrate, to movement of liquid which, depending of frequency, causes the basilar membrane to reach a peak amplitude at a specific site. This movement is conveyed to the organ of Corti inside the scala media, and ultimately produces nerve impulses perceived as sound.

External links
[Slide from University of Kansas]
[Diagram at IUPUI]

Scala tympani

Sensory system - Auditory system - [http://encycl.opentopia.com/ edit]
Outer ear: Pinna > Ear canal Middle ear: Eardrum | Ossicles (Malleus, Incus & Stapes) | Stapedius | Tensor tympani | Eustachian tube
Inner ear: Cochlea (Scala vestibuli, Scala media & Scala tympani) | Oval window | Helicotrema | Round window | Basilar membrane | Reissner's membrane | Organ of Corti | Hair cells | Stereocilia
Brain: Cochlear nerve^VIII → Cochlear nuclei → Superior olivary nuclei → Inferior colliculi → Medial geniculate nuclei → Primary auditory cortex

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