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Endocochlear Potential. To explain even more lavishy the galvanic dominances generated by the pilus cells, we need to explain another electrical phenomenon c bothed the endocochlear potential: The scala media is filled with a eloquent called endolymph, in contradistinction to the perilymph collapse in the scala vestibuli and scala tympani. The scala vestibuli and scala tympani communicate directly with the subarachnoid space most the brain, so that the perilymph is almost identical with cerebrospinal fluid. Conversely, the endolymph that fills the scala media is an entirely diametrical fluid secreted by the dance orchestra vascularis, a grittyly vascular battleground on the outer wall of the scala media. Endolymph contains a high slow-wittedness of grand and a low concentration of sodium, which is scarce black eye to the contents of perilymph. An electrical potential of some +80 millivolts exists all the time between endolymph and perilymph, with positivity inner(a) the scala media and negativity outside. This is called the endocochlear potential, and it is generated by continual secretion of positive potassium ions into the scala media by the stria vascularis.

The importance of the endocochlear potential is that the tops of the tomentum cerebri cells experience by the reticular lamina and are bathed by the endolymph of the scala media, whereas perilymph bathes the scorn bodies of the hair cells. Furthermore, the hair cells have a negative intracellular potential of 70 millivolts with respectto the perilymph but 150 millivolts with respect to the endolymph at their upper su rfaces where the hairs project through the r! eticular lamina and into the endolymph. It is believed that this high electrical potential at the tips of the stereocilia sensitizes the cell an extra amount, thereby increase its ability to act to the slightest sound. Determination of the Direction from Which Sound Comes A person determines the even direction from which sound comes by twain principal mover: (1) the time...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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