PSYCH261 Chapter Notes - Chapter 4: Medial Geniculate Nucleus, Auditory Cortex, Vestibular Nuclei
6 Sep 2017
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Cochlea: scala vestibule (vestibular pathway, scala media (middle, scala tympani (tympanic pathway) Organ of corti incus: basilar membrane, moved by sound waves relative to tectorial membrane which bends hair cells, hair cells, receptor cells, attached to basilar membrane by deiter"s cells, have cilia, top attached to tectoral membrane tectorial membrane. These are the receptors in the auditory + vestibular system. Endolymph: high in k+ low in na, opposite of plasma, plasma = perilymph. Each hemisphere get info from both ears but primarily contralaterally. Auditory info is also sent to cerebellum and reticular formation. This is the relationship between basilar membrane and cortex. Association cortex: anterior stream, begins at anterior parabelt region, involved in analysis of complex sounds, posterior streams, beings at posterior parabelt region, involved in sound localization. Fundamental frequency lowest and most intense freq of a complex sound, it is the sound"s basic pitch.
