101Lecture09_2009

101Lecture09_2009 - Lecture Topic 9 The Somatic Sensory...

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Lecture Topic 9 The Somatic Sensory System General Organization of the Sensory Pathways • Made up of at least three neurons –Primary sensory afferent –Second order neuron (interneurons) –Third order neurons (typically in the thalamus)
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Sensory Information is Sent to the Contralateral Brain Region Figure 5.28 Receptors Transduce Stimuli Energy • Receptors “capture” stimuli • Stimuli take various forms –e.g. photons, sound waves, pressure • Transduction is the conversion of stimuli form/energy into electrical signals
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Receptor Types Figure 6.1 Receptor Neuron Transduction Figure 6.1 Receptor Neuron
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Receptor Cell and Primary Afferent Transduction Figure 6.1 Receptor Cell Depolarization Receptor Properties
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Receptors Indicate The Intensity of a Stimulus • Action potential frequency • Number of receptors activated Figure 6.3 Receptors are Modality Speci±c • Modality = stimulus type/”energy” • Photoreceptors VS touch/mechanoreceptors
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• Slow Adapting
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This note was uploaded on 04/14/2009 for the course NPB 2 taught by Professor Bautisca during the Spring '09 term at UC Davis.

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101Lecture09_2009 - Lecture Topic 9 The Somatic Sensory...

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