The parasympathetic system uses which structure for preganglionic cell bodies instead of the intermediate horn?

The parasympathetic system uses which structure for preganglionic cell bodies instead of the intermediate horn?

• A. Very specific nuclei housing preganglionic cells in S2-S4
• B. Intermediolateral column in T1-L2
• C. Lateral horn in the thoracic region
• D. Dorsal root ganglia

Answer: (A)

Parasympathetic preganglionic neurons do not sit in the intermediolateral column like the sympathetic neurons. Instead, their cell bodies are located in two main places: brainstem nuclei for the cranial outflow and very specific nuclei in the sacral spinal cord at S2–S4. These sacral nuclei are dedicated regions that house the preganglionic parasympathetic cells responsible for pelvic organs. This arrangement explains why the correct description highlights very specific nuclei in the S2–S4 region. The other options pull you toward the sympathetic system or sensory structures: the intermediolateral column in T1–L2 is the sympathetic preganglionic center, the lateral horn in the thoracic region is part of that sympathetic setup, and the dorsal root ganglia contain sensory, not autonomic, neurons.

Parasympathetic preganglionic neurons do not sit in the intermediolateral column like the sympathetic neurons. Instead, their cell bodies are located in two main places: brainstem nuclei for the cranial outflow and very specific nuclei in the sacral spinal cord at S2–S4. These sacral nuclei are dedicated regions that house the preganglionic parasympathetic cells responsible for pelvic organs. This arrangement explains why the correct description highlights very specific nuclei in the S2–S4 region.

The other options pull you toward the sympathetic system or sensory structures: the intermediolateral column in T1–L2 is the sympathetic preganglionic center, the lateral horn in the thoracic region is part of that sympathetic setup, and the dorsal root ganglia contain sensory, not autonomic, neurons.