Chapter 16, Problem 1CT

Summary Introduction

Case Summary

The autonomic nervous system (ANS) causes dilation of the pupil of eye after seeing a pleasurable object.

Adequate Information:

The autonomic nervous system is a part of the peripheral nervous system, which controls and coordinates the activities of the organs. The nerve cells of the ANS are attached to the smooth muscles of the organ.

To determine:

The part of the ANS causes dilation of the pupil and the nerve pathway involved in this.

Given Information:

ANS has two important divisions’ sympathetic and parasympathetic systems, which help in regulating the activity of specific structures. They are present on the preganglionic neuron of the CNS and autonomic ganglia of the PNS. The sympathetic axons travel through the sympathetic chain ganglia to their target cell.