A woman has cut her finger while dicing onions in the kitchen, causing her to drop her knife in pain. Which of the following components of this pain signal was transmitted by a third-order neuron? The neurons:
A) Between the woman's finger and her spinal cord
B) Between the thalamus and the cortex
C) Between the CNS and the thalamus
D) Of the efferent pathway that causes muscle contraction
Ans: B
Feedback:
First-order neurons transmit sensory information from the periphery to the CNS. Second-order neurons communicate with various reflex networks and sensory pathways in the spinal cord and travel directly to the thalamus. Third-order neurons relay information from the thalamus to the cerebral cortex. This typology does not apply to motor neurons.
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