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Questions and Answers
Which type of pain is transmitted through the pathway of 'quick pain'?
Which type of pain is transmitted through the pathway of 'quick pain'?
- Chronic, aching pain
- Burning, stinging pain
- Crude, diffuse pain
- Sharp, acute, bounded pain (correct)
Where do the dendrites of the first neuron run?
Where do the dendrites of the first neuron run?
- In the lateral funiculus
- In the spinal nerves (correct)
- In the posterior horn of the spinal cord
- In the anterior white commissure
What is the function of the intralaminar nucleus?
What is the function of the intralaminar nucleus?
- To regulate temperature and crude touch
- To project emotional responses to pain to the cingulate gyrus (correct)
- To modulate diffuse pressure and pain
- To transmit pain signals to the thalamus
Which tract is formed by the axons of the third neuron?
Which tract is formed by the axons of the third neuron?
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In which part of the spinal cord do the axons of the second neuron run?
In which part of the spinal cord do the axons of the second neuron run?
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What is the function of the lateral spino-thalamic tract?
What is the function of the lateral spino-thalamic tract?
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Study Notes
Neuronal Pathway of Crude Sensibility
- Pathway of crude sensibility originates from the contralateral part of the body, transmitting sensations of heat, cold, pain, crude touch, and pressure
- Located in the anterior and lateral funiculus of the spinal cord
Components of the Pathway
- Lateral Spino-Thalamic Tract: responsible for transmitting temperature and pain sensations
- Anterior Spino-Thalamic Tract: responsible for transmitting diffuse pressure, crude touch, and pain sensations
- Pathway of "Quick Pain": transmits sharp, acute, and bounded pain
Neurons Involved
- 1st Neuron: pseudounipolar cells of the spinal ganglion
- Dendrites run in spinal nerves
- Axons go to the posterior horn of the spinal cord
- 2nd Neuron: ipsilateral ncl. proprius of the posterior horn
- Axons cross over in the anterior white commisure at the same segment level
- Run contralaterally in the anterior and lateral funiculus
- Continue as spinal lemniscus to the thalamus
- 3rd Neuron: contralateral ventral posterolateral nucleus of the thalamus
- Axons form the thalamocortical tract
- Pass through the internal capsule to the postcentral gyrus
Additional Projections
- Some axons from 2nd neurons terminate in the intralaminar nucleus
- Projecting to the cingulate gyrus (limbic system) for emotional response to pain
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