Psyc 310 Week 4.docx - The movement of stapes causes fluid...

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The movement of stapes causes fluid to move and vibration in the basilar membrane. The organ of corti is a long strip of hair cells and supporting stereocilia that helps control the excitation of a hair cell and generate nerve impulses from the vibration of the basilar membrane and fluid movement. The hair cells in the organ of corti are two groups of hair cells in bundle of 30 to 300 with cilia or sterecocilia that projected into the perilymph and endolymph fluid in the scala media. The cilia helps control the excitation of the hair cells. The tunnel of corti separates the two groups of the hair cells. There are about 12,000 outer hair cells, the band of the outer hair cells is wide and attached to the tectorial membrane that vibrates or move the basilar membrane. The outer hair cells are contractile cells that amplify the vibrations of basilar membrane and fluid movement. The outer hair cells contribute to the sensitivity of the inner hair cells.
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