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11centralauditory_2009

11centralauditory_2009 - Auditory System Central Pathways F...

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Auditory System: Central Pathways
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C o c h l e a A u d i t o r y N e r v e D o r s a l C o c h l e a r N u c l e u s A n t e r o V e n t r a l C o c h l e a r N u c l e u s P o s t e r o V e n t r a l C o c h l e a r N u c l e u s M e d i a l S u p e r i o r O l i v e L a t e r a l S u p e r i o r O l i v e L a t e r a l L e m n i s c u s I n f e r i o r C o l l i c u l u s M e d i a l G e n i c u l a t e C o r t e x A c o u s t i c S t r i a : D o r s a l I n t e r m e d i a t e V e n t r a l F U N C T I O N : I d e n t i f y a n d p r o c e s s c o m p l e x s o u n d s P r i n c i p a l r e l a y t o c o r t e x F o r m f u l l s p a t i a l m a p L o c a t e s o u n d s o u r c e s i n s p a c e S t a r t s o u n d f e a t u r e p r o c e s s i n g Parallel pathways, each analyzes particular features Streams separate in cochlear nucleus: different cell types project to specific nuclei in a manner somewhat reminiscent of “what” and “where” pathways in vision.
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Cochlea Auditory Nerve Dorsal Cochlear Nucleus Antero Ventral Cochlear Nucleus Postero Ventral Cochlear Nucleus Medial Superior Olive Lateral Superior Olive Lateral Lemniscus Inferior Colliculus Medial Geniculate Cortex Acoustic Stria: Dorsal Ventral FUNCTION: Identify and process complex sounds Principal relay to cortex Form full spatial map Locate sound sources in space Start sound feature processing Intermediate
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Cochlear Nuclei VIII nerve: branches to innervate the 3 cochlear nuclei in a tonoptopic pattern: Dorsal Cochlear Nucleus Posteroventral CochlearNucleus Anteroventral Cochlear Nucleus Start of feature processing. Distinct cell classes in the ventral nuclei: Stellate Cells preserve stimulus intensity. Bushy Cells preserve stimulus timing.
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Cochlea Auditory Nerve Dorsal Cochlear Nucleus Antero Ventral Cochlear Nucleus Postero Ventral Cochlear Nucleus Medial Superior Olive Lateral Superior Olive Lateral Lemniscus Inferior Colliculus Medial Geniculate Cortex Acoustic
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