What is unique about the ionic composition of endolymph?
The membranous labyrinth is filled with endolymph, which is unique among extracellular fluids of the body, including the perilymph, in that its potassium ion concentration is higher (about 140 milliequivalents per litre) than its sodium ion concentration (about 15 milliequivalents per litre).
What is endolymph made of?
Endolymph is created from perilymph. The endocochlear potential is the sum of two potentials: a positive potential caused by active secretion of K+ by the stria vascularis (120mV) and a negative potential created by the passive diffusion of K+ ions from the hair cells (40mV), which can be visualised after an anoxia.
Is endolymph high in K+?
The scala media (pink) is filled with endolymph, an unusual extracellular fluid that is high in K+ and low in Na+ and Ca2+ content.
What is perilymph made of?
The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid. The major cation in perilymph is sodium, with the values of sodium and potassium concentration in the perilymph being 138 mM and 6.9 mM, respectively. It is also named Cotunnius’ liquid and liquor cotunnii for Domenico Cotugno.
What is the differences between endolymph and perilymph?
Endolymph is the fluid found inside the membranous labyrinth while perilymph is the fluid that surrounds the endolymph, located inside the bony labyrinth. The conversion of sound waves into the nerve impulses occurs inside the endolymph while the perilymph transforms the sound waves into the endolymph.
What is the function of the endolymph?
Endolymph is a fluid located deep in the inner ear that is essential to normal hearing, as well as balance and movement.
What is the main function of endolymph?
Is endolymph in semicircular canals?
The semicircular canals consist of membranous floating canals within a bony encasement. The membranous canals contain a fluid called endolymph and floats within a fluid balled perilymph.