Perilymph

Perilymph

Perilymph is an extracellular fluid located within the cochlea (part of the ear) in 2 of its 3 compartments; the scala tympani and scala vestibuli. The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid. The major cation of perilymph is sodium.

Perilymph vs. endolymph

The third compartment of the ear, the cochlear duct (or scala media) contains endolymph. Perilymph and endolymph have unique ionic compositions suited to their functions in regulating electrochemical impulses of hair cells. The electric potential of endolymph is ~80-90 mV more positive than perilymph. [cite journal |author=Konishi T, Hamrick PE, Walsh PJ |title=Ion transport in guinea pig cochlea. I. Potassium and sodium transport |journal=Acta Otolaryngol. |volume=86 |issue=1-2 |pages=22–34 |year=1978 |pmid=696294 |doi=]

Clinical significance

It has also been suggested that perilymph and endolymph participate in a unidirectional flow that is interrupted in Meniere's disease.

External links

* http://oto.wustl.edu/cochlea/intro3.htm

References


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Look at other dictionaries:

  • Perilymph — Per i*lymph, n. (Anat.) The fluid which surrounds the membranous labyrinth of the internal ear, and separates it from the walls of the chambers in which the labyrinth lies. [1913 Webster] …   The Collaborative International Dictionary of English

  • perilymph — [per′ə limf΄] n. the fluid that surrounds the membranous labyrinth of the inner ear: cf. ENDOLYMPH …   English World dictionary

  • Perilymph fistula — Infobox Disease Name = PAGENAME Caption = DiseasesDB = 32218 ICD10 = ICD10|H|83|1|h|80 ICD9 = ICD9|386.4 ICDO = OMIM = MedlinePlus = eMedicineSubj = med eMedicineTopic = 2736 eMedicine mult = eMedicine2|emerg|414 | MeshID = A labyrinthine fistula …   Wikipedia

  • perilymph fistula — perilymphatic fistula rupture of the round window with leakage of perilymph into the middle ear, causing sensorineural hearing loss; it usually results from trauma such as barotrauma or from an erosive disease process …   Medical dictionary

  • perilymph — noun Etymology: International Scientific Vocabulary Date: circa 1839 the fluid between the membranous and bony labyrinths of the ear …   New Collegiate Dictionary

  • perilymph — n. [Gr. peri, around; L. lympha, water] (MOLLUSCA: Cephalopoda) In Octopodidae, the liquid that fills the outer sac of the statocyst …   Dictionary of invertebrate zoology

  • perilymph — perilymphatic, adj. /per i limf /, n. Anat. the fluid between the bony and membranous labyrinths of the ear. [1830 40; PERI + LYMPH] * * * …   Universalium

  • perilymph — noun An extracellular fluid found in the scala tympani and scala vestibuli of the cochlea …   Wiktionary

  • perilymph — The fluid contained within the osseus labyrinth, surrounding and protecting the membranous labyrinth; p. resembles extracellular fluid in composition (sodium salts are the predominate positive electrolyte) and, via the perilymphatic …   Medical dictionary

  • perilymph — n. fluid within the inner ear (Anatomy) …   English contemporary dictionary

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