How does distribution of sympathetic nerves differ from the distribution of parasympathetic nerves?
A. Only parasympathetic nerves innervate the thoracic region.
B. Spinal nerves contain sympathetic fibers, while cranial nerves contain parasympathetic fibers.
C. Only the sympathetic division serves the head and neck.
D. Sympathetic fibers innervate the abdominal cavity, while parasympathetic fibers innervate the pelvic region.
Answer: B
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