Human Anatomy & Physiology (9th Edition)

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

Chapter 15 - The Special Senses - Review Questions: 5

Answer

Chapter 15. RVQ # 5 Ans; c. Convergence The medial recti muscles are extraocular muscles of the eye that are innervated by the oculomotor nerve (Cranial iII). When the medial recti contract, they adduct or turn the eyes (in the horizontal plane) towards the nose. This process is necessary for the eyes to focus on objects that are very near. It is called convergence of the eyes, Damage to the medial recti would impair near vision.

Work Step by Step

The medial recti are extraocular or extrinsic muscles that are attached to the eyeball. Their function is to turn the eye inward towards the nose in a process called convergence. This movement is necessary to enable the eyes to focus on objects that are near. If the medial recti muscles were damaged ,convergence would be inadequate and consequently focus at near distance would be impaired.
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