Card 7 / 23: Should the region of the central canal expand, as it did in this case of syringomyelia, what will happen ?
A.)
The local monosynaptic Ia motoneuron reflexes will be impaired or missing.
B.)
The pressure may impair or destroy the anterior white commissure and hence cause a bilateral loss of pain and thermal sensation in the corresponding dermatomes.
C.)
The pressure will destroy the dorsal columns resulting in a loss of fine touch and vibratory sense.
D.)
There will be no clinical problem.
Answer:
B.) The pressure may impair or destroy the anterior white commissure and hence cause a bilateral loss of pain and thermal sensation in the corresponding dermatomes.
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Furthermore, the spinoreticular tract, corticospinal tract and ventral spinocerebellar tract axons also pass through the anterior white commissure. We have not been and will not be learning this much detail. A lesion would result in a bilateral loss of pain and temperature from the cord segments involved.
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Neuroanatomy 05 Somesthetic Sensation
Author:
M.D.Stephen VoronLecturer
University of Utah
USA
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