A "Dilated and Fixed" Pupil Indicates Pressure on Which Cranial

Question

A "dilated and fixed" pupil indicates pressure on which cranial nerve?
A) Cranial nerve II
B) Olfactory nerve
C) Cranial nerve III
D) Vestibulocochlear

Accepted Answer

A dilated and fixed pupil is a sign of pressure on the oculomotor nerve (cranial nerve III) which controls the constriction of the pupil. Cranial nerve II (optic nerve) controls vision, olfactory nerve controls sense of smell, and vestibulocochlear nerve controls hearing and balance, and pressure on these nerves may not result in changes in pupil size.