APC 100 Neuro Powerpoint 2011 part 4

APC 100 Neuro Powerpoint 2011 part 4 - Nervous System...

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Nervous System Nervous System Anatomy and Functional Organization Anatomy and Functional Organization Part 4 Part 4 Jim Sharp DVM, PhD Jim Sharp DVM, PhD jwsharp@ucdavis.edu APC Anatomy 100 APC Anatomy 100
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Hair Cells These systems have common origin Lateral line system in fish Based on mechanoreceptors Hair cell – basic mechanoreceptor No hairs – microvilli (stereocilia) Tonofilaments stiffen microvilli Microvilli – different lengths Disturb microvilli- depolarization Uni-directional activation Lateral Line, Vestibular, and Auditory Systems
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Neuromast Organ Basic receptor unit for 3 systems Hair cells Supportive cells Sensory neurons Cupla – gelatinous cap Cupula > sensitivity Lateral Line System
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Detects pressure waves in water Occurs only in fish, not bird or mammals Neuromasts embedded in lateral line canals Lateral Line Sys concentrated on head, but extends down body Lateral Line System
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Lateral Line System Hair cells embedded in cupula in different directions Firing rate > in only one direction Integration of discharge rates Direction of travel Water disturbances Solid objects Schooling Finding prey
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Balance & proprioceptive system Derived from lateral line system Inner ear of birds and mammals Vestibular apapratus – 3 semicircular canals – 2 chambers • Sacculus • Utriculus 3 semicircular canals oriented at right angles – 3 planes of space Vestibular System
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Semicircular Canals & Cristae Sensory organ for semicircular canals are cristae Cristae are basically neuromast organs Semicircular canals filled with endolymph When head is accelerated endolymph lags Microvilli are distorted Detects angular acceleration Vestibular System
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Vestibular System Sacculus and Utriculus & Maculae Sensory organ for sacculus and utriculus are maculae Maculae modified neuromast organs with otoliths Otolith acts as weights > sensitivity Sacculus and utriculus filled with endolymph Maculae respond to Linear accleration Orientation in gravity Vestibular system tells whether body is in motion and its orientation in space
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Vestibular System CN VIII Most fibers synapse in vestibular nuclei Some go directly to cerebellum Secondary fibers from vestibular nuclei go to cerebellum Some go to eye motor nuclei Orient eyes in space Some will form vestibulospinal tract
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Anatomy of the Ear Consists of two systems:
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This note was uploaded on 04/05/2011 for the course APC 100 taught by Professor Kelliewhited during the Spring '07 term at UC Davis.

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APC 100 Neuro Powerpoint 2011 part 4 - Nervous System...

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