Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 6 - Section 6.1 - The Skin and Subcutaneous Tissue - Before You Go On - Page 185: 5

Answer

The boundary between the epidermis and dermis is histologically conspicuous and usually wavy. The upward waves are fingerlike extensions of the dermis called dermal papillae (see fig. 6.3), and the downward epidermal waves between the papillae are called epidermal ridges. The dermal and epidermal boundaries thus interlock like corrugated cardboard, an arrangement that resists slippage of the epidermis across the dermis.

Work Step by Step

Figure 6.3;Also "The Dermis" Page 180
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