The parasympathetic division originates from which region?

The parasympathetic division originates from which region?

• A. Thoracolumbar
• B. Craniosacral
• C. Lumbar
• D. Sacral

Answer: (B)

Parasympathetic preganglionic neurons originate in the brainstem and the sacral spinal cord, a region classically described as craniosacral. This means the calming, rest‑and‑digest signals come from nuclei in the brainstem (via certain cranial nerves) and from the sacral segments of the spinal cord (S2–S4). The term craniosacral captures both sources, which is why it’s the correct description of the parasympathetic origins. In contrast, the sympathetic division arises from the thoracic and upper lumbar region (the thoracolumbar area), so those other options don’t describe the parasympathetic origins.

Parasympathetic preganglionic neurons originate in the brainstem and the sacral spinal cord, a region classically described as craniosacral. This means the calming, rest‑and‑digest signals come from nuclei in the brainstem (via certain cranial nerves) and from the sacral segments of the spinal cord (S2–S4). The term craniosacral captures both sources, which is why it’s the correct description of the parasympathetic origins. In contrast, the sympathetic division arises from the thoracic and upper lumbar region (the thoracolumbar area), so those other options don’t describe the parasympathetic origins.