BIOL 121 Lecture Notes - Lecture 9: Ventral Cochlear Nucleus, Hypothalamus, Hair Cell
Document Summary
Contains the organ of corti - where the hair cells are. The tectorial membrane hangs over the organ of corti. Helicotrema: a hole between the scala vestibuili and scala tympani. Where high frequencies are encoded: apex. Organ of corti: lies on the basilar membrane, contains hair cells. Inner hair cells: business, frequency & auditory transduction, action potential. Motile response: a response to sound of the outer hair cells in which the cells move. The cells tilt and get slightly longer, which amplifies basilar membrane vibration and therefore amplifies the response of inner hair cells. The auditory pathway: hair cells (inner, spiral ganglion cells, ventral cochlear nucleus, superior olive, auditory cortex (temporal lobe) Primary auditory cortex: low frequencies are represented anteriorly in auditory cortex and high frequencies are represented posteriorly. Unlike the visual system - destruction of the auditory cortex in one hemisphere does not result in the loss of hearing on one side.
