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fundies-ch6 - Neurophysiology Neurons Gross Anatomy The...

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Neurophysiology Neurons Gross Anatomy The Central Auditory Nervous System Frequency and Intensity encoding Central Auditory Processing Binaural Processing Central Control (Descending Systems) Cortical Processing
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The Neuron Dendrites receive synaptic stimulation (neurotrans.) Action Potential generated in soma near axon AP conducted along axon from Node to Node (saltatory conduction) AP produces release of neurotransmitter at terminal boutons
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An Action Potential (or Spike)
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Two Descriptors for Neurons Afferent (sensory)-- carrying signals toward the brain Efferent (motor) -- carrying signals from brain to periphery
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Afferent Afferent & Efferent Neurons
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4 Types of Cochlear Neurons INNER HAIR CELLS > Multiple (10 to 20) Afferent synapses > (Efferents synapse on afferent dendrites) OUTER HAIR CELLS: > Large Efferent synapses engulf base of cell > Small (& not very active) Afferent synapses
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IHC Innervation Pattern
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OHC Innervation Pattern
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Inner hair cells Synapse at the base with up to 20 afferent neurons “Divergence” Efferents synapse on afferent dendrites under IHCs
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IHC activation alters firing rate
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Afferent neurons have their cell bodies in the Spiral Ganglion (4)
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Central Nervous System Structures Nucleus = a group of nerve cell bodies Fiber Tract = a group of axons
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Major Components of the Central Auditory Nervous System (CANS) VIIIth cranial nerve Cochlear Nucleus Superior Olivary Complex
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