BIOS 286 Lecture Notes - Lecture 8: Stellate Cell, Parallel Computing, Ganglion
Document Summary
Auditory nerve fibers phase lock for some frequencies. Phase locking is another way frequency information is carried. Mostly to outer hair cells (towards body) Lengthening increases flexibility between basilar membrane and tectorial membrane, increasing sensitivity for the nearby inner hair cell. Movement increases the responsiveness of the inner hair cells (cochlear amplifier) Good for paying attention to some sounds and not others. The unmyelinated afferents from the outer hair cells provide feedback information that helps control the length of the outer hair cells. Efferents form the brain stimulate the outer hair cells. This protects the inner hair cells and outer hair cells from damage. Stereocilia movements from sound amplify membrane movements, increase response of inner hair cells. First synapse in the cns is in the cochlear nucleus. Types of cells in the cochlear nuclei and their responses to brief current pulses. Auditory nerve fibers terminate in the cochlear nucleus. Each fiber splits to innervate the 3 divisions (divergence)
