Sensory System

Sensory System - • Pacinian corpuscle deep touch •...

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Sensory System: Sensory Processes Sensory Transduction Conversion of the sensory stimulus into action potentials General sequence of sensory (afferent) process 1. Initiate action potential at primary sensory receptors 2. AP conduction through DRG (dorsal root ganglion) axons to spinal column 3. Synapse with second or higher order neurons 4. Information (APs) reaches primary sensory cortex pyramidal – voluntary ; extrapyramidal – involuntary Sensation: basic recognition of sensory input Perception: interpretation of sensory input Modulation: PNS modulation, CNS modulation Classification of sensory receptors 1. Mechanoreceptors Meissner’s corpuscle: corpuscle of touch
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Unformatted text preview: • Pacinian corpuscle: deep touch • Muscle spindle: • Tendon receptors: • Merkel’s dis: touch and pressure receptor 2. Thermoreceptors • Krause’s corpuscle: cold, stretchy, tough • Ruffini’s corpuscle: warm, pressure 3. Nociceptors: • Free nerve endings: touch 4. Photoreceptors: • Rods and cones: light perception 5. Chemoreceptors: • Taste • Smell • Blood CO2 Receptor (Generator) potentials • Caused by an increase in ion channel conductance, mainly for Na+ • Direct relationship between the amplitude of receptor potential and AP frequency...
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This note was uploaded on 04/23/2011 for the course BIME 2102 taught by Professor Kim during the Spring '11 term at UVA.

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