01:146:245 Lecture Notes - Lecture 9: Dorsal Cochlear Nucleus, Interaural Time Difference, Cochlear Nucleus

• School: Rutgers University
• Department: Cell Biology and Neuroscience
• Course: 01:146:245
• Professor: Professor Wilhelms

Document Summary

~there"s one row of inner hair cells and three rows of outer hair cells. ~the inner hair cells are the real sensory receptors. ~95% of axons in auditory nerve are from inner hair cells. ~outer hair cells mostly get efferent info from some other place (?) ~outer hair cells can change stiffness of tectorial membrane, helps the cochlea sharpen the frequency. ~auditory nerve is the major part of cranial nerve viii (8) ~there are two cochlear nuclei in brainstem, one for each ear. ~multiple outer hair cells synapse with a single ganglion cell. ~each ganglion only synapses with one inner hair cell. ~remember the spiral ganglion cells have their central processes going towards cochlear nucleus in brain. ~when the auditory nerve fibers reach cochlear nucleus, they branch into ascending and descending. Ascending branch goes to anteroventral cochlear nucleus (acn) Descending branch goes to posteroventral cochlear nucleus (pcn) & dorsal cochlear nucleus (dcn)