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Auditory Nerve

S&H A&P PowerPoint 6

QuestionAnswer
Describe type II fibers within the cochlear nerve Unmyelinated, too small to be studied, 5% of cochlear nerve. Spiral and make connection with three rows of outer hair cells.
Describe type I fibers within the cochlear nerve Black, fatty coat of myelin wraps the nerve of each fiber, 95% of cochlear nerve. Each contacts ONE inner hair cell.
Type I and type II fibers are both afferant, and both conduct information from the cochlea to the central nervous system
What happens in the absence of sound? Auditory nerve fibers fire action potentials randomly--spontaneous discharge of glutamate from IHC (spontaneous activity)
What are the two mechanisms of frequency coding? Tonotopy and phase-locking
Phase-locking action potential is in phase at the same moment as the peak of condensation--therefore brain knows frequency of action potential by counting wavelengths. Reliable up to 4kHz
What are the two mechanisms of intensity level coding? Firing rate and spread of excitation
Firing rate the rate at which action potential is fired according to the frequency
Spread of excitation The amount of action potential fired at different points along the basilar membrane
Created by: 100000299709410