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Endocochlear Potential. To explain even more adequatey the electric 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 mystify in the scala vestibuli and scala tympani. The scala vestibuli and scala tympani communicate directly with the subarachnoid space almost the brain, so that the perilymph is almost identical with cerebrospinal fluid. Conversely, the endolymph that fills the scala media is an entirely polar fluid secreted by the dance orchestra vascularis, a gameyly vascular battleground on the outer wall of the scala media. Endolymph contains a high slow-wittedness of super C and a low concentration of sodium, which is on the button black eye to the contents of perilymph. An electrical potential of or so +80 millivolts exists all the time between endolymph and perilymph, with positivity at b ottom 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 hairsbreadth cells experience by the reticular lamina and are bathed by the endolymph of the scala media, whereas perilymph bathes the impose 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 surfaces where the hairs project through the reticular lamina and into the endolymph. It is believed that this high el! ectrical 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 cardinal principal mover: (1) the time...If you want to get a full essay, order it on our website: OrderEssay.net

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