Over 90% of all parasympathetic fibers are derived from cranial nerve ___________.
A) V (trigeminal)
B) XII (hypoglossal)
C) VII (facial)
D) X (vagus)

Question

Quizplus · Accepted Answer

The majority of the parasympathetic fibers in the body are derived from the vagus nerve (cranial nerve X), which has widespread distribution to many organs and controls many involuntary functions such as digestion, heart rate, and respiratory rate. The other cranial nerves listed (V, VII, and XII) have more limited parasympathetic functions.

Over 90% of All Parasympathetic Fibers Are Derived from Cranial