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22 Cards in this Set
- Front
- Back
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Where does nociceptive pain arise from and what receptors does it activate? |
damage to non-neural tissue activating pain receptors (nociceptors) |
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What is neuropathic pain caused by? |
A lesion of the somatosensory nervous system |
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How might pain of unknown origin be enhanced? |
CNS excitability or loss of central inhibition |
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By what pathway are pain and temperature sensations carried? |
Via the spinothalamic |
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Where is the first order neuron cell body located? |
the dorsal root ganglion |
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Where do the first order neurons enter the cord, travel, and then end? |
Tract of Lissauer and ascends 1 to 3 levels before it ends in the substantial gelatinous of the dorsal horn |
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Where is the second order neuron cell boy located? |
substantia gelatinosa |
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Where does the second order neuron start, travel and end? |
Starts in the substantia gelatinous and crosses the contralateral side of the spinal cord in the anterior white commissure, and then enters the lateral spinothalamic tract. |
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Where does the lateral spinothalamic tract end? |
Ascends the spinal cord and brainstem to the end in the ventral posterolateral nucleus of the thalamus. (VPL) |
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Where are the third order neuron cell bodies, travel, and then end? |
in the VPL and then run superiorly through the posterior limb of the internal capsule to end in the post central gyrus of the cortex. |
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What is the area 3,1,2 of the post central gyrus called? |
primary somatosensory cortex |
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Where will symptoms show up if the first order neuron is affected? |
The ipsilateral side of the lesion |
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Why are the signs and symptoms of a first order neuron lesion found below the level of injury? |
Because the first order neuron usually ascends the spinal cord before crossing over. |
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Why might sensations be felt bilaterally below the level of the lesion? |
If the lesion involves the anterior white commissure because first order fibers from both sides of the body cross the spinal cord. |
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Where will the signs and symptoms show up if the second order neurons are affected? |
on the contralateral side of the injury |
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What would the lesion of a second order lesionpresent with? |
Contralaterally beginning a few levels below the level of the lesion. |
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Where would the signs and symptoms of a third order neuron be presented? |
Contralaterally |
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What might lesions involving the thalamus produce? |
thalamic syndrome |
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What do deep touch, proprioception, vibration, and two point discrimination involve? |
dorsal columns of the spinal cord and the liminiscal system in the brainstem. |
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What are the neurons involved in the leminiscal system? |
1) First order neurons 2) Second order neurons 3) Third order neurons |
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What is stereognosis? |
the ability to determine three dimensional structure by using tactile sense |
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What is the name of the condition where the patient has tactile input, but is unable recognize objects placed in their hand without visual cues. |
Astereognosis |
