Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 10 - The Muscular System - Review Questions - Critical Thinking and Clinical Application Questions - Page 384: 4


Peter was pleased with Sue's performance. The single blink or squint of the right eye is often used as a flirting gesture. The contraction of the opponens pollicis is usually employed in the action of opposition of the thumb to the first finger; in America, that gesture usually means , "OK", "Good Show" or "I approve".

Work Step by Step

The obicularis oculi is a tripartite muscle under the skin around the eye. The palpebral section operates when we squint involuntarily. The orbital portion acts to close the eye voluntarily. The terms "squint" and "blink" are often confused. Peter's eye motion was more like a voluntary flirtatious squint than an involuntary blink , though both actions have been considered involuntary in some eye disorders. The raising of the right hand with a contracted opponens pollicis ( opposed thumb) affirms that Peter was pleased with Sue's performance.
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