Question 5 / 19:  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.
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Explanation:

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

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Attribution:  Stephen C. Voron, M.D., Suzanne S. Stensaas, Ph.D. , Department of Neurobiology and Anatomy, University of Utah, School of Medicine, Salt Lake City, Utah 84132, http://library.med.utah.edu/kw/hyperbrain
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