BIOS 2400 Lecture Notes - Lecture 10: Semicircular Canals, Cochlear Duct, Cochlear Nerve
13 Mar 2017
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Bios 2400 - chapter 10 - sensory physiology. Influenced by receptive field size and lateral inhibition: smaller the receptive field, the faster the first neuron fires (ex. Fingertip: lateral inhibiton: sharpening of sensation; sensory neurons whose receptive fileds are stimulated most strongly inhibit sensory nueorns that serve neighoring recpetive fields. Vestibulocochlear nerve cerebellum and vestibular nuclei of the medulla oblongata. Inner ear: houses two different sensory system, cochlea: contains receptors for conversion of sound waves into nerve impulses which makes hearing possible, vestibular apparatus: necessary for sense of equilibrium, hearing: neural perception of sound energy. Low-frequency (pitch) sounds, such as at 500 hz, cause peak vibrations of the basilar membrane more toward the apex of the cochlea (to the right in this figure). Innermost coat under choroid: consists of outer pigmented layer and inner nervous-tissue layer; contains rods and cones.
