Question

CN III originating in the midbrain is assessed by the nurse for an early indication of pressure on the brainstem by

a. assessing for nystagmus
b. testing the corneal reflex
c. testing pupillary reaction to light
d. testing for oculocephalic (doll's eye) reflex

Answer 1

The afferent branch of the competing reflex (dilation) is the optic nerve, while the efferent branch is the sympathetic nervous system.

Step-by-step explanation:

The afferent branch of the competing reflex (dilation) is the optic nerve. This is the sensory component that carries information from the retina to the brain. The efferent branch is the sympathetic nervous system, which is responsible for dilating the pupil when light levels are low.