Essentials of Human Anatomy & Physiology (12th Edition)

Published by Pearson
ISBN 10: 1292216239
ISBN 13: 978-1-29221-623-2

Chapter 7 - The Nervous System - Review Questions - Page 303: 48

Answer

His accessory nerve is damaged.

Work Step by Step

The accessory nerve controls two neck muscles: the trapezius and sternocleidomastoid. These muscles are responsible for the shrugging action of the shoulder. Since he is not able to shrug one of his shoulders, this nerve must have been damaged.
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