Where are the craniosacral preganglionic neuron cell bodies located?

Where are the craniosacral preganglionic neuron cell bodies located?

• A. Brainstem and sacral spinal cord
• B. Thoracic and lumbar
• C. Cervical and thoracic
• D. Brain and spinal cord cortex

Answer: (A)

Craniosacral preganglionic neuron cell bodies are located in the brainstem and the sacral spinal cord. This arrangement forms the parasympathetic (craniosacral) outflow, with preganglionic neurons in brainstem nuclei associated with cranial nerves III, VII, IX, and X, and in spinal cord segments S2–S4. From there, these fibers synapse on postganglionic neurons near or within the target organs. The other options describe locations for different autonomic pathways—thoracic and lumbar for sympathetic preganglionic neurons, cervical and thoracic for a mix that doesn’t fit craniosacral output, and cortex pathways—which aren’t where preganglionic cell bodies of the craniosacral system reside.

Craniosacral preganglionic neuron cell bodies are located in the brainstem and the sacral spinal cord. This arrangement forms the parasympathetic (craniosacral) outflow, with preganglionic neurons in brainstem nuclei associated with cranial nerves III, VII, IX, and X, and in spinal cord segments S2–S4. From there, these fibers synapse on postganglionic neurons near or within the target organs. The other options describe locations for different autonomic pathways—thoracic and lumbar for sympathetic preganglionic neurons, cervical and thoracic for a mix that doesn’t fit craniosacral output, and cortex pathways—which aren’t where preganglionic cell bodies of the craniosacral system reside.