Question

preganglionic fibers of parasympathetic neurons are present in all of the following cranial nerves except
ix.
vii.
xii.
x.
iii.

Explanation:

• The hypoglossal nerve (XII) is a motor nerve that innervates the muscles of the tongue. It has no parasympathetic preganglionic fibers.
• The oculomotor nerve (III) has parasympathetic fibers that control the ciliary muscle and sphincter pupillae.
• The facial nerve (VII) has parasympathetic fibers for lacrimal, submandibular, and sublingual glands.
• The glossopharyngeal nerve (IX) has parasympathetic fibers for the parotid gland.
• The vagus nerve (X) has extensive parasympathetic distribution to thoracic and abdominal viscera.

Answer:

XII.