Cordotomy involves cutting into the spinothalamic tracts, which run up the front / side ( anterolateral ) quadrant of the spinal cord, carrying heat and pain signals to the brain.
22.
There are two main parts : the lateral spinothalamic tract, which transmits pain and temperature, and the anterior ( or ventral ) spinothalamic tract, which transmits crude touch and pressure.
23.
There are two main parts : the lateral spinothalamic tract, which transmits pain and temperature, and the anterior ( or ventral ) spinothalamic tract, which transmits crude touch and pressure.
24.
The spinothalamic tract thus decussates very soon after entering the spinal cord, ascending in the spinal cord, contralateral to the side from where it provides ( pain and temperature ) sensory information.
25.
Unmyelinated nerve fibers for itch and pain both originate in the skin; however, information for them is conveyed centrally in two distinct systems that both use the same nerve bundle and spinothalamic tract.
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Interestingly, temperature and pain perception follow the same neural pathway from the peripheral nervous system to the diencephalon-- the spinothalamic tract .-- Mark Bornfeld DDS 17 : 39, 19 September 2006 ( UTC)
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The loss of sensation on the opposite side of the lesion is because the nerve fibers of the spinothalamic tract ( which carry information about pain and temperature ) crossover once they meet the spinal cord from the peripheries.
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A delta fibers ( A? fibers ) and C fibers carrying pain sensation in the spinothalamic tract contribute to this commissure, as do fibers of the anterior corticospinal tract, which carry motor signals from the primary motor cortex.
29.
On the contralateral ( opposite side ) of the lesion, there will be a loss of pain and temperature sensation and crude touch 1 or 2 segments below the level of the lesion via the Spinothalamic Tract of the Anterolateral System.
30.
Sensation of pain and temperature is preserved, because the spinothalamic tract is located more laterally in the brainstem and is also not supplied by the anterior spinal artery ( instead supplied by the posterior inferior cerebellar arteries and the vertebral arteries ).
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