Afferent neurons

Question

Afferent neurons

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Question: Afferent neurons
Option 1: Transmit messages to the spinal cord
This is the core definition of afferent (sensory) neurons: they carry sensory information from the periphery toward the CNS, including the spinal cord. So this choice accurately describes their primary direction of signal flow.
Option 2: Have a motor function
Motor (efferent) neurons carry signals away from the CNS to muscles or glands to trigger actions. Afferent neurons do not primarily have motor functions, so this statement is incorrect.
Option 3: Transmit information to effector organs
Transmitting information to effector organs is the role of motor neurons (efferent neurons) that act on muscles or glands. Afferent neurons relay sensory information to the CNS rather than sending commands to effectors, so this is false.
Option 4: Have cell bodies that originate in the CNS
In afferent neurons, the cell bodies are typically located in dorsal root (or cranial nerve) sensory ganglia outside the CNS, with central processes entering the CNS. Saying their cell bodies originate in the CNS is incorrect; it describes many central neurons or some efferent pathways, but not classic afferent neurons. Therefore this is inaccurate.
Overall, option 1 correctly identifies the primary function and direction of afferent neurons, while options 2–4 describe roles or anatomical features that do not align with the defining characteristics of afferent (sensory) neurons.

ANSC20001_2025_SM1 Week 4 - The nervous system & neurons (Example MCQs)

Afferent neurons

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