BIOL 2410 Lecture Notes - Lecture 22: Sensorineural Hearing Loss, Vestibular System, Vestibulocochlear Nerve
28 Nov 2016
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Document Summary
Action potentials in the primary sensory neurons lead to synaptic activity with nuclei located in the medulla. Primary sensory neurons form the cochlear branch of the vestibulocochlear nerve. Form the medulla secondary sensory neurons can carry information to the nuclei located in the mid-brain and the thalamus. Secondary sensory neurons send information to the same side of the brain (ipsilateral) and the opposite side of the brain (contralateral) Ensures both ears receive the same sets of info. The pitch of the sound is determined by the frequency of sound entering the ear. The basilar membrane is narrow and rigid near to its attachment site and becomes exible and wide at its most distal point. Low frequency sound created the most activity at the distal end. High frequency sound created the most activity at the proximal end. The location along the basilar membrane where the signal is created is translation of frequency into spatial coding.
