Cross-section of cochlea. The cochlea is the auditory portion of the Inner ear. Its core component is the Organ of Corti, the sensory organ of hearing, which is distributed along Perilymph is located in the scala tympani and scala vestibuli - the aqua regions at the top and bottom of the diagram. Scala tympani is one of the Perilymph -filled cavities in the Cochlear labyrinth. Scala vestibuli is a Perilymph filled cavity inside the Cochlea of the Inner ear.

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 cochlea is the auditory portion of the Inner ear. Its core component is the Organ of Corti, the sensory organ of hearing, which is distributed along The ear is the sense organ that detects Sounds The Vertebrate ear shows a common biology from Fish to Humans with variations Scala tympani is one of the Perilymph -filled cavities in the Cochlear labyrinth. Scala vestibuli is a Perilymph filled cavity inside the Cochlea of the Inner ear. The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid. Blood plasma is the Liquid component of Blood, in which the Blood cells are suspended Cerebrospinal fluid ( CSF) Liquor cerebrospinalis, is a clear Bodily fluid that occupies the Subarachnoid space and the Ventricular system The major cation of perilymph is sodium. Sodium (ˈsoʊdiəm is an element which has the symbol Na( Latin natrium, from Arabic natrun) atomic number 11 atomic mass 22

Perilymph vs. endolymph

The third compartment of the ear, the cochlear duct (or scala media) contains endolymph. The cochlear duct (or scala media) is an Endolymph filled cavity inside the Cochlea, located in between the Scala tympani and the Scala Endolymph is the fluid contained in the Membranous labyrinth of the Inner ear. 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. ^[1]

Clinical significance

It has also been suggested that perilymph and endolymph participate in a unidirectional flow that is interrupted in Meniere's disease. Ménière's disease (meɪnˈyɛərz is a disorder of the Inner ear that can affect hearing and Balance.

External links

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

References

1. ^ 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. PMID 696294.