Question

Preganglionic parasympathetic fibres arise from ................. spinal segments.

• A. Thoracic and lumbar
• B. Thoracic and sacral
• C. Brain and lumbar
• D. Brain and sacral

Answer 1

The correct option is D Brain and sacral

Parasympathetic nerve fibres arise from the central nervous system with the $S_2$, $S_3$, and $S_4$ spinal nerves and from the third, seventh, ninth, and tenth cranial nerves. Because of its location, the parasympathetic system is commonly referred to as having craniosacral outflow.