As long as the cell body survives, neurons can grow new axons by following the S
ID: 174989 • Letter: A
Question
As long as the cell body survives, neurons can grow new axons by following the Schwann cells that surrounded the original axons. Assuming that a cell body in the severed limb would be less likely to survive, would the chance of successful regeneration differ between somatic sensory and somatic motor pathways?
a. Yes. Only the somatic sensory neurons have their cell body in the periphery (e.g. skin), so they are less likely to survive and regenerate axons.
b. Yes. Only the somatic motor neurons have their cell body in the periphery (muscles), so they are less likely to survive and regenerate axons.
c. No. Both somatic sensory and somatic motor neurons have their cell body in the spinal cord, so they are equally likely to survive and regenerate axons.
d. No. Somatic motor neurons have their cell body in the spinal cord, and somatic sensory neurons have their cell body nearby in the dorsal root ganglia, so they are equally likely to survive and regenerate axons.
Explanation / Answer
Option c is true because the second order neuron of both somatic sensory and somatic motor tracts heir cell body in the spinal cord. Also the first order neurons of both have their cell body in dorsal root ganglia. So they can survive and regenerate axons.
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