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)
32.
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.
33.
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.
34.
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.
35.
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 ).
36.
Note that at least some of the output from the hypothalamus lies outside of the DLF, within a set of Descending Hypothalamic Fibers running next to the spinothalamic tract; lesions of this area canonically lead to ipsilateral Horner's syndrome.
37.
The medioposterior ensemble, in most of its volume does not receive subcortical afferents and abundant afferences from the " associative " cortex but in some, essentially ventral parts, in fact receives subcortical afferences, such as tectal, spinothalamic or amygdalar.
38.
The "'posterior trigeminothalamic tract "'( or "'dorsal trigeminothalamic tract "') serves as a pain and temperature pathway from the face, head and neck ( the facial equivalent of the spinothalamic tract ).
39.
The axons of the tract cells cross over ( decussate ) to the other side of the spinal cord via the anterior white commissure, and to the anterolateral corner of the spinal cord ( hence the spinothalamic tract being part of the anterolateral system ).
40.
In humans, temperature sensation enters the spinal cord along the axons of Lissauer's tract that synapse on second order neurons in grey matter of the decussate, joining the spinothalamic tract as they ascend to neurons in the ventral posterolateral nucleus of the thalamus.
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