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 - Page 589: 28


Answer (c). Macula Lutea The macula lutea , also called the yellow spot, lies exactly opposite to the eye;s posterior pole. The center of the macula is the fovea centralis The pin-sized fovea is area where visual,acuity is sharpest, and where resolution of details is best.

Work Step by Step

The macula lutea is a spot of yellow pigmented tisssue located precisely at the posterior pole of the eye. The yellow color is due to caretenoids and the absorb ultraviolet light. At the center of the macula is the fovea centrals. The macula consists mainly of cones , but the fovea centralis is all cones(no rods); therefore the fovea is the spot on the retina where objects can be most sharply focused . Since the fovea is not much larger than a pin head in area to focus sharply on and appreciable area or on several objects, the viewer must keep repositioning objects ( or areas of objects) or keep switching (changing position of) his /her eyes.
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