What role does a first-order neuron play in the passage of a sensory signal to the brain?

A. The first-order neuron carries the sensory signal to the thalamus.
B. The first-order neuron detects the stimulus and transmits a signal to the spinal cord or brainstem.
C. The first-order neuron carries the signal to the sensory area of the cerebral cortex.
D. The soma of the first-order neuron is in the cerebral cortex and the axon terminates in the spinal cord.

The first-order neuron plays a crucial role in the transmission of sensory signals to the brain. It serves as the initial carrier of sensory information, detecting the stimulus and transmitting the signal to the spinal cord or brain-stem, not to the cerebral cortex. The soma of the first-order neuron is typically located in the dorsal root ganglion just outside the spinal cord.

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