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19 Cards in this Set
- Front
- Back
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describe pain fibers
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small, thin, and unmyelinated
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A-delta nerve fibers
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myelinated
bare nerve endings associated with pain and cool temperature |
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C fibers
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unmyelinated
bare nerve endings associated with pain, warm temperature, and itch |
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associated with pain and temperature from the face
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spinal trigeminal tract
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corresponding parts of the body are found where in the posterior columns
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most medially - leg
moving laterally - lower trunk, upper trunk, arm, neck, occiput |
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corresponding parts of the body are found where in the anterolateral column
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most lateral - leg
moving medially - trunk, arm, neck |
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associated with posterior column
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vibration and proprioception
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associated with anterolateral tract
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pain and temperature
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gate theory of pain
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proposes that these telencephalic regions modulate the transmission of pain via a and B fibers at the dorsal horn
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telencephalic regions
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hypothalamus, amygdala, and cortex
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how does transcutaneous electrical nerve stimulation reduce pain
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activates alpha and beta fibers
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how does the periaqueductal gray inhibit pain
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receives input from telencephalic regions and activates neuron in the rostral ventral medulla which contains raphe nucleus that projects seritonin to the spinal cord, it also activates the locus coeruleus activating NE release sent to the dorsal horn
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two nuclei involved in pain modulation
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raphe nucleus
lcus coeruleus |
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how does the rostral ventral medulla activate the locus coeruleus
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substance P fibers
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what activates the rostral ventral medulla
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periaqueductal gray
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endogenous opiates
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enkephalin
B-endorphin dynorphin |
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where is B-endorphin found in high concentration
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hypothalamus
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Dejerrine-Roussy syndrome
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lesions of the thalamus can cause radiating contralateral pain into the limbs
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hyperpathia/allodynia
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pain induced by minor sitmuli like light touch, or air passing over the skin
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