Sensory System

Sensory System - Pacinian corpuscle: deep touch Muscle...

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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: Merkels dis: touch and pressure receptor 2. Thermoreceptors Krauses corpuscle: cold, stretchy, tough Ruffinis 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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