Lecture_15-3 - have 3 Inner ear – 3 semicircular canals saccule utricle and cochlea Cochlea = where sound is converted into impulses that travel

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Two major neural pathways involved in song: 1. Main descending motor pathway - OUT 2. Anterior forebrain pathway – IN Major song nuclei include: HVC – High Vocal Center RA – Robust nucleus of the arcopallium Auditory field L nXIIts – tracheosyringeal portion of the hypoglossal nucleus DLM – dorsolateral nucleus in the thalamus Area X LMAN - lateral portion of the magnocellular nucleus of the anterior neostriatum (DON’T NEED TO MEMORIZE FULL NAMES – JUST ABBREVIATIONS) Main descending motor pathway has two subpathways: a. HVC RA nXIIts (direct pathway) b. HVC Area X DLM LMAN RA nXIIts (recursive loop) – don’t need to memorize this. *These produced different song types. Both pathways ultimately control the syrinx and syringeal muscles. How do birds perceive song? Ear: Birds have small ear holes – have no pinna unlike mammals Short canal leading to the tympanic membrane covered by special feathers that do not obstruct sound
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Middle ear = 1 middle ear bone (stapes or columnella), unlike mammals that
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Unformatted text preview: have 3 Inner ear – 3 semicircular canals, saccule, utricle, and cochlea Cochlea = where sound is converted into impulses that travel to the brain. Sound hits tympanic membrane which vibrates “ vibrates stapes or columnella w vibrates oval window & causes waves in internal fluid & bends hair cells & sends impulses to brain. Birds hear within the same range as humans. When the impulses get to the brain, they must be decoded. This is done by the anterior forebrain pathway: Includes three main auditory centers that respond to sound: DLM, Field L, and LMAN These centers have neurons that respond to different aspects of sound. The signals from the different neurons within the nuclei paint a picture of the sound. Then, signals are sent to the other nuclei in the brain that have different functions. HVC, RA, and nXIIts – motor DLM, Field L, and LMAN – auditory centers Area X – song memory/crystallization....
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This note was uploaded on 04/08/2011 for the course POUL 3123 taught by Professor Navara during the Spring '09 term at University of Georgia Athens.

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Lecture_15-3 - have 3 Inner ear – 3 semicircular canals saccule utricle and cochlea Cochlea = where sound is converted into impulses that travel

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