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Multiple Choice
What are the origins of parasympathetic preganglionic neurons?
A
Thoracolumbar regions of the spinal cord
B
Craniosacral regions of the spinal cord
C
Lumbosacral regions of the spinal cord
D
Cervicothoracic regions of the spinal cord
Verified step by step guidance
1
Understand the role of the parasympathetic nervous system: It is part of the autonomic nervous system responsible for 'rest and digest' functions.
Identify the origin of parasympathetic preganglionic neurons: These neurons originate from specific regions of the central nervous system.
Recognize the craniosacral outflow: Parasympathetic preganglionic neurons originate from the brainstem (cranial nerves III, VII, IX, and X) and the sacral spinal cord (S2-S4).
Differentiate from the sympathetic nervous system: The sympathetic nervous system has a thoracolumbar origin, which is different from the craniosacral origin of the parasympathetic system.
Conclude that the correct origin of parasympathetic preganglionic neurons is the craniosacral regions of the spinal cord, as opposed to thoracolumbar, lumbosacral, or cervicothoracic regions.