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12 Cards in this Set
- Front
- Back
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The somatosensory systen |
-sensation of the body and it's movements -system responsible for perception of touch, pressure, vibration, pain, temperature, position, and movement that arises from joints, skin, and fascia -detects different sensory modalities |
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Skin functions |
-protects organs -thermoregulations -cannot survive without skin -largest organ in body |
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Glabrous skin |
-hairless skin -palms of hands and soles of feet |
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Skin layers |
-subcutaneous tissue -dermis -epidermis -various receptors throughout these layes |
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Types of receptors |
-thermoreceptors-temperature -mechanoreceptors-touch -nocioceptors-noxious stimuli(painful stimuli) |
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The mechanoreceptors |
-pacinian corpuscle -meissner's corpuscle |
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Temperature |
-thermoreceptors detect a wide range of temperatures 8-52 C -6 known thermoreceptors -TRPM8 responds to chemical menthol |
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General somatosensory pathway |
-sensations detected in the periphery-->dorsal root in spinal cord--->brainstem, and thalamic nuclei to the somatosensory cortex--->signal passes to the brain attributed to that area of the body--allows the stimulus to be felt at the correct location |
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Pain |
-extremely unpleasant but provides useful info that can help us avoid injury -free nerve endings in the skin -sensation |
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Nocioceptors |
-detectors of noxious stimuli -3 types: high threshold mechanoreceptors(intense pressure), TRPV1(heat and acid), TRPA1(chemicals that produce inflammation) |
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Hurt |
-is an emotion -pain and emotion activates of somatosensory cortex and hyphothalamus, amygdala, and cingulate cortex |
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Itch |
-unknown receptors -release of histamines |
