Question

preganglionic fibers leave the cns and then synapse on

visceral reflex receptors.

motor neurons.

postganglionic fibers.

afferent neurons.

ganglionic neurons.

Explanation:

Preganglionic fibers are part of the autonomic nervous system. In the autonomic nervous system, preganglionic fibers (which are neurons originating in the central nervous system - CNS) synapse with ganglionic neurons (neurons located in autonomic ganglia).

• Visceral reflex receptors are for detecting stimuli, not for synapsing with preganglionic fibers.
• Motor neurons (somatic motor neurons) are not the target of preganglionic fibers in the autonomic context.
• Postganglionic fibers are the fibers that come after the synapse with ganglionic neurons, not the direct synaptic target.
• Afferent neurons carry sensory information to the CNS, not the target of preganglionic efferent (from CNS) fibers in the autonomic nervous system.

Answer:

ganglionic neurons.