Question

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

Explanation:

Parasympathetic preganglionic fibers are associated with certain cranial nerves. The oculomotor nerve (III) has parasympathetic fibers for eye - related functions. The vagus nerve (X) has extensive parasympathetic innervation. The glossopharyngeal nerve (IX) has some parasympathetic components. The facial nerve (VII) also has parasympathetic fibers. However, the hypoglossal nerve (XII) is a motor nerve for tongue muscles and has no parasympathetic preganglionic fibers.

Answer:

XII.