Question

chapter 14 multiple choice question 8
1 part | -- of 1 point

over 90% of all parasympathetic axons are derived from cranial nerve ______.

○ x (vagus)
○ xii (hypoglossal)
○ vii (facial)
○ v (trigeminal)

Explanation:

To solve this, we recall the role of cranial nerves in the parasympathetic nervous system. The vagus nerve (cranial nerve X) is responsible for most (over 90%) of parasympathetic axons, innervating many organs. The hypoglossal (XII) controls tongue movement, facial (VII) has some parasympathetic but not majority, and trigeminal (V) is sensory/motor for face, not major parasympathetic.

Answer:

A. X (vagus)