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10 Cards in this Set
- Front
- Back
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Somatosensory system
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-consists of part of the CNS and PNS which process sensory info from the body wall
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Where are touch receptors located?
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-superficially in the skin (dermis)
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Where are proprioception receptors located?
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-deep in the muscle/tendon/joint capsule systems
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Where are free nerve endings for pain, temp and chemoreception located?
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-superficially in the skin (epidermis) and viscera
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What is the threshold difference btw touch receptors and pain receptors?
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-touch receptors have much lower thresholds of activation
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How do meissner/merkel receptive fields compare to those of pacinian and ruffini corpuscles?
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-the fields of meissner/merkel are smaller
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Regions of the body wall that have high sensitivity are characterized by what?
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-innervation by a large number of sensory fibers and by fibers that have small receptive fields
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By what two mechanisms is stimulus intensity coded?
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-a frequency code in individual fibers
-a code involving the number of fibers activated |
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Label line principle
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-concept of modality specialization of an individual fiber
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What three factors contribute to the label line principle?
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1. type of receptor
2. location of fiber endings 3. threshold |
