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Crista Ampullaris (start of semicircular canals) detect angular acceleration. At each ampullae there is hair cells with cilium and stereocilim, sticking up in the cupula (round circle filled with fluid). Each semicircle canal resides in frontal, horizontal, and saggital plane to detect all direction of rotations. As head turns, endolymph (fluid) lags behind, pushes capula, and stimulate the hair cells.
An endocochlear potential (EP) of +80 mV is essential for audition. Although the regulation of K+ concentration ([K+]) in various compartments of the cochlear stria vascularis seems crucial for the formation of the EP, the mechanism remains uncertain. We have used multibarreled electrodes to measure the potential, [K+], and input resistance in each compartment of the stria vascularis. The stria faces two fluids, perilymph and endolymph, and contains an extracelluar compartment, the intrastrial