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31 Cards in this Set
- Front
- Back
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somatosensory
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touch, proprioception, temp, pain
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receptor types
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thermo, mechano, noci, proprioceptors
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receptor properties
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most unimodal, part of PNS, synapse at spinal cord, adapt, have receptive field
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tonic receptors
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slow adapting, slow acting, info on steady state stimuli
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phasic receptors
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quick adapting, quick acting, info on change in stimuli
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receptive field
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smaller= greater acuity
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mechanoreceptors
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cutaneous, low threshold + high sensitivity, encapsulated or unencapsulated, cell body in dorsal root ganglion
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mechanoreceptor types
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merkels discs, meissner's corpuscle, ruffini corpuscle, pacinian corpuscle
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merkels discs
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in epidermis, small field, sustained touch, slow adapting
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meissner corpuscle
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superficial, small field, touch + texture, fast
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ruffini's corpuscles
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parallel to skin, large field, tension + stretch, slow
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pacinian corpuscle
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subcutis, large field, pressure, fast
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proprioceptors
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position of limbs in space
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proprioceptor types
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muscle spindles, golgi tendon organs
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muscle spindles
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in skeletal muscle, stretch receptors (signal muscle length)
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golgi tendon organs
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in tendons, detect tension, overload devices
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proprioceptive pathway
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1st order to spinal cord, 2nd to thalamus/cerebellum, 3rd to somatosensory cortex
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decussation in spinal cord
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touch and proprioception stay on same side, pain and temp decussate
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thermoreceptors
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free nerve endings, sudden changes in temp
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TRP channels
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transient receptor potential ion channels, cause influx of Na and Ca, have distinct thermal activation ranges
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nociceptors
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physiological detection of processing of painful stimuli, primary afferents terminate in spinal dorsal horn
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pain paradox
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pain in necessary and protective
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nociception phases
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acute, subchronic, chronic
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classes of noxious sensations
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heat, chemical, mechanical, cold
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nociceptive receptors
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mechanical, thermal, chemical
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ascending pain pathways
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spinothalamic, spinoreticular, spinomesencephalic
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spinothalamic
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to cord, crosses, to thalamus, to sensory cortex
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spinoreticular
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to cord, crosses, to reticular formation, to brain
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spinomesencephalic
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to midbrain, activates periaqueductal gray
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pain activates
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amygdala, hippocampus, posterior parietal cortex, basal ganglia, brainstem
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pain perception factors
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mood, cognition, pathology, injury,contex, genetics
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