A pupillary reflex is integrated in the brain stem so it is classified as a ________reflex.The smooth muscle of the iris is the effector,so this is classified as a(n)___________.
A)Spinal;somatic
B)Spinal;autonomic
C)Cranial;somatic
D)Cranial;autonomic
E)Spinal;visceral

Question

Quizplus · Accepted Answer

The fact that the pupillary reflex is integrated in the brain stem indicates that it is a cranial reflex. Additionally, the smooth muscle of the iris is innervated by the autonomic nervous system, making this reflex an autonomic reflex. Therefore, the best choice is D: Cranial; autonomic.

A Pupillary Reflex Is Integrated in the Brain Stem So