Endolymph - wikipedia Endolymph Endolymph Cross-section of cochlea. ( Endolymph is located in the cochlear duct - the light green region at the middle of the diagram. ) illustration of otolith organs showing detail of utricle, ococonia, endolymph, cupula, macula, hair cell filaments, and saccular nerve Details Identifiers Latin endolympha MeSH D004710 TA A15. 3.03. 061 FMA 61112 Anatomical terminology ( edit on Wikidata ) Endolymph is the fluid contained in the membranous labyrinth of the inner ear. It is also called Scarpa 's fluid, after Antonio Scarpa. Contents 1 Structure 1.1 Composition 2 Function 3 Clinical significance 4 Additional images 5 See also 6 References 7 External links Structure The inner ear has two parts : the bony labyrinth and the membranous labyrinth. The membranous labyrinth is contained within the bony labyrinth, and within the membranous labyrinth is a fluid called endolymph. Between the outer wall of the membranous labyrinth and the wall of the bony labyrinth is the location of perilymph. Composition 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 due to a higher concentration of K compared to Na. The main component of this unique extracellular fluid is potassium, which is secreted from the stria vascularis. The high potassium content of the endolymph means that potassium, not sodium, is carried as the de-polarizing electric current in the hair cells. This is known as the mechano - electric transduction ( MET ) current. Endolymph has a high positive potential ( 80 -- 120 mV in the cochlea ), relative to other nearby fluids such as perilymph, due to its high concentration of positively charged ions. It is mainly this electrical potential difference that allows potassium ions to flow into the hair cells during mechanical stimulation of the hair bundle. Because the hair cells are at a negative potential of about - 50 mV, the potential difference from endolymph to hair cell is on the order of 150 mV, which is the largest electrical potential difference found in the body. Function Fluid waves occur in the endolymph in the various parts of the membranous labyrinth in response to fluid waves in the perilymph. Hearing : Cochlear duct : fluid waves in the endolymph of the cochlear duct stimulate the receptor cells, which in turn translate their movement into nerve impulses that the brain perceives as sound. Balance : Semicircular canals : angular acceleration of the endolymph in the semicircular canals stimulate the vestibular receptors of the endolymph. The semicircular canals of both inner ears act in concert to coordinate balance. Clinical significance Disruption of the endolymph due to jerky movements ( like spinning around or driving over bumps while riding in a car ) can cause motion sickness. A condition where the volume of the endolymph is greatly enlarged is called endolymphatic hydrops and has been linked to Ménière 's disease. Additional images Inner ear illustration showing semicircular canal, hair cells, ampulla, cupula, vestibular nerve, & fluid See also Dark cell Perilymph Stria vascularis Organ of Corti Ménière 's disease References Jump up ^ synd / 2926 at Who Named It ? Jump up ^ Konishi T, Hamrick PE, Walsh PJ ( 1978 ). `` Ion transport in guinea pig cochlea. I. Potassium and sodium transport ''. Acta Otolaryngol. 86 ( 1 - 2 ) : 22 -- 34. doi : 10.3109 / 00016487809124717. PMID 696294. Jump up ^ What makes people dizzy when they spin ? Jump up ^ Ménière 's Disease Information Center - Cause of Ménière 's Disease External links Longitudinal Flow of Endolymph at wustl.edu Anatomy of hearing and balance Outer ear Auricle helix antihelix tragus antitragus intertragic notch earlobe Ear canal Auricular muscles Eardrum umbo pars flaccida Middle ear Tympanic cavity Medial structures oval window round window secondary tympanic membrane prominence of facial canal promontory of tympanic cavity Posterior structures mastoid cells aditus to mastoid antrum pyramidal eminence Ossicles Malleus superior ligament lateral ligament anterior ligament Incus superior ligament posterior ligament Stapes annular ligament Muscles stapedius tensor tympani Auditory tube / Eustachian tube Torus tubarius Inner ear / ( membranous labyrinth, bony labyrinth ) Auditory system / Cochlear labyrinth General cochlea Vestibular duct Helicotrema Tympanic duct Modiolus Cochlear cupula Perilymphatic space Perilymph Cochlear aqueduct Cochlear duct / scala media Reissner 's / vestibular membrane Basilar membrane Reticular membrane Endolymph Stria vascularis Spiral ligament Organ of Corti stereocilia tip links Tectorial membrane Sulcus spiralis externus internus Spiral limbus Cells Claudius cell Boettcher cell Vestibular system / Vestibular labyrinth Vestibule Utricle macula Saccule macula Kinocilium Otolith Vestibular aqueduct endolymphatic duct endolymphatic sac Ductus reuniens Semicircular canals Superior semicircular canal Posterior semicircular canal Horizontal semicircular canal Ampullary cupula Ampullae crista ampullaris Retrieved from `` https://en.wikipedia.org/w/index.php?title=Endolymph&oldid=825176404 '' Categories : Human head and neck Ear Body fluids Hidden categories : Pages with unresolved properties All articles with unsourced statements Articles with unsourced statements from September 2008 Talk Contents About Wikipedia Català Čeština Deutsch Español Français Galego Bahasa Indonesia Italiano Norsk Polski Português Suomi 5 more Edit links This page was last edited on 11 February 2018, at 22 : 42. 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Question: what is the role of the endolymph of the semicircular canals
Answer: Balance