PSYCH 3A03 Lecture Notes - Low Frequency, Stereocilia, Psych

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Acoustic energy: pressure across cochlear partition, generation of signals to the brain and ihcs, displacement of basilar membrane, modulation of current through ohcs, mechanical transduction by ohcs. Contains afferent (sensory) and efferent (motor) fibers. Efferent auditory nerve fibers originate from the superior olivary complex in the cns. Lateral superior olive (lso) projects to type i afferent synapse innervating. Medial superior olive (mso) projects to basel portion of ohc. Afferent/efferent anfs exit organ of corti via habenula perforate. Afferent anfs enter modiolus in ordered manner (twisted bundle) Anfs from the apex of cochlea are in center of twisted bundle. Low frequency anfs located on the inside of auditory nerve. Anfs from the base of cochlea are on outside of twisted bundle. Cranial nerve viii is composed of auditory and vestibular nerves. Stereocilia deformation changes haircell receptor potential, which leads to neurotransmitter release, resulting in a spike (action potential) in a sensory neuron.

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