sandra
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19. Which of the following neural crest derivatives is
involved in congenital absence of pain perception?
A. Large-diameter neurons of dorsal root ganglia
B. Postganglionic parasympathetic neurons
C. Postganglionic sympathetic neurons
D. Schwann cells
E. Small-diameter neurons of dorsal root ganglia
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| DrS
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E?
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| icemaiden
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E
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| sridevibandaru24
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E
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| MRMAVERICK
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YA E-AS OF THE AVAILABLE OPTION IT LOOKS LIKE THE ONLY OPTION TO BE INVOLVED IN PAIN
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| young_doc
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In case some of you are as confused as i was when i "guessed" E =)
It seems that the Large neurons (A-Alpha or A-Beta fibers) are for mechanoreception (like in muscle spindles, and Meissner/Pacinian corpuscles...
Smaller neurons (delta-fibers) are from the bare neurons, and are for Pain & Temp...
http://www.cumc.columbia.edu/dept/ps/2007/firstyear/ns/ns14.pdf#search=%22%22small%20diameter%20neurons%22%20pain%20'large%20diameter%20neurons%22%20%22dorsal%20root%20ganglia%22%20function%22
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| young_doc
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OOPS! here's the link again if anyone wants to dwell into this topic further. Sorry bout that.
http://www.cumc.columbia.edu/dept/ps/2007/firstyear/ns/ns14.pdf#search=%22%22small%20diameter%20neurons%22%20pain%20'large%20diameter%20neurons%22%20%22dorsal%20root%20ganglia%22%20function%22
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| young_doc
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hmm...doesn't seem to let me put the whole link in...oh well 
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