The pathways for discriminative touch and conscious proprioception use a three-neuron relay. Which one of the following describes the role of the secondary neuron?
A. Conveys information from the receptors to the medulla.
B. Conveys information from the thalamus to the cerebral cortex.
C. Conveys information from the thalamus to the medulla.
D. Conveys information from the medulla to the thalamus.
ANS: D
Rationale: The pathway for discriminative touch and conscious proprioception uses a three-neuron relay: (1) the primary neuron conveys information from the receptors to the medulla; (2) the secondary neuron conveys information from the medulla to the thalamus; and (3) the tertiary neuron conveys information from the thalamus to the cerebral cortex.
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