There is also a connection from the subarachnoid space to the bony labyrinth of the inner ear via the perilymphatic duct where the perilymph is continuous with the cerebrospinal fluid.
22.
Vestibular and tympanic ducts are filled with perilymph, and the smaller cochlear duct between them is filled with endolymph, a fluid with a very different ion concentrations and voltage.
23.
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.
24.
In a positive fistula test ( for the presence of a fistula from cholesteatoma to the labyrinth ), pressure on the tragus causes vertigo or eye deviation by inducing movement of perilymph.
25.
Due to its location, the basilar membrane places the hair cells in a position where they are adjacent to both the endolymph and the perilymph, which is a precondition of hair cell function.
26.
This gene is expressed in fetal cochlea and many other tissues, and is thought to be involved in the development and maintenance of the inner ear or the contents of the perilymph and endolymph.
27.
The perilymph that is found in the scala tympani has a low potassium concentration, whereas the endolymph found in the scala media has a high potassium concentration and an electrical potential of about 80 millivolts compared to the perilymph.
28.
The perilymph that is found in the scala tympani has a low potassium concentration, whereas the endolymph found in the scala media has a high potassium concentration and an electrical potential of about 80 millivolts compared to the perilymph.
29.
The base of the stapes couples vibrations into the cochlea via the oval window, which vibrates the perilymph liquid ( present throughout the inner ear ) and causes the round window to bulb out as the oval window bulges in.
30.
Perilymph is the fluid contained within the bony labyrinth, surrounding and protecting the membranous labyrinth; perilymph resembles extracellular fluid in composition ( sodium salts are the predominate positive electrolyte ) and, via the perilymphatic duct, is in continuity with cerebrospinal fluid.
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