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.
32.
Since those fluid waves move the cochlear partition that separates the ducts up and down, the waves have a corresponding symmetric part in perilymph of the " tympanic duct ", which ends at the round window, bulging out when the oval window bulges in.
33.
With the movement of the basilar membrane, a shear force is created and a small potential is generated due to a difference in potential between the endolymph ( scala media-+ 80 mV ) and the perilymph ( vestibular and tympanic ducts-- 70 mV ).
34.
The " stapes " ( stirrup ) ossicle bone of the middle ear transmits vibrations to the " fenestra ovalis " ( oval window ) on the outside of the cochlea, which vibrates the perilymph in the " vestibular duct " ( upper chamber of the cochlea ).
35.
Stria vascularis is a rich bed of capillaries and secretory cells; Reissner's membrane is a thin membrane that separates endolymph from perilymph; and the basilar membrane is a mechanically somewhat stiff membrane, supporting the receptor organ for hearing, the organ of Corti, and determines the mechanical wave propagation properties of the cochlear system.
36.
If the transport of nitrogen into the vascular compartment by perfusion exceeds removal of helium by perfusion, while transfer of helium into the vascular compartment by diffusion from the perilymph and endolymph exceeds the counterdiffusion of nitrogen, this may result in a temporary increase in total gas tension, as the input of nitrogen exceeds the removal of helium, which can result in bubble formation and growth.
37.
TMD fails to provide accurate estimates of ICP mostly because the acoustic impedance and its changes due to the acoustic reflex are dominantly determined by the structures and functional properties of the middle ear, and only marginally influenced by changes in ICP . A measurable acoustic phenomenon that originates in the inner ear would, at least in theory, allow for more precise assessment of the pressure of the peri-and endo-lymph, and consequently, of ICP . Otoacoustic emission ( OAE ), which is a sound generated by subtle oscillations of the endo-and perilymph caused by contractions of the outer hairy cells of the inner ear in response to a loud sound, seems to offer such a possibility.
