Lec15 - Neurobiology V - Lecture 15 Nervous System V: The...

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Lecture 15 Nervous System V: The Sensory System Reading: Chapter 6, pp. 250 – 258, 280 - 286 Lecture Outline: Sensory Receptors Generator Potentials Vision
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Sensory Receptors Free dendrite endings – e.g., pain and temperature receptors. Dendrites endings embedded in nonneural tissue – e.g., pressure receptors. Form synapse with other neurons – e.g., photoreceptors (synapse with retinal neurons). Modified epithelial cells activate sensory neurons – e.g., taste buds, and hair cells of inner ear.
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Sensory Receptor Neuron – is a pseudounipolar neuron. Anatomically dendrite receives and axon delivers the nerve impulse. Functionally, however, the process work as single long axon.
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Functional catagories of Sensory Receptors Chemoreceptors Photoreceptors Thermoreceptors Mechanoreceptors Nociceptors - have higher activation threshold than other skin receptors.
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Generator Potentials Stimulus intensity ~ Frequency of AP Stimulus Threshold Action Potentials Generator Potentials
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Vision
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This note was uploaded on 09/12/2010 for the course BIOLOGY 225 taught by Professor Pavgi during the Winter '10 term at University of Michigan.

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Lec15 - Neurobiology V - Lecture 15 Nervous System V: The...

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