High Yield Embryology – Ronald W Dudek

Development of the tongue. (A) At week 5. (B) In the newborn. (Adapted from Dudek RW, Fix JD: BRS Embryology, 2 nd ed. Baltimore, Williams & Wilkins, 1998, p 153.) 3. General sensation from the mucosa is carried primarily by the glossopharyngeal nervelCNDa 4. Taste sensation from the mucosa is carried predominantly by the glossopharyn- geal nerve . C. Muscles of the tongue 1. The intrinsic muscles and extrinsic muscles (styloglossus, hyoglossus, genioglos- sus, and palatoglossus) are derived from myoblasts that migrate into the tongue re- gion from Occipital somites^ 2.

Motor innervation for all muscles of the tongue is supplied by the hypoglossal nerve (CN^XIW, except for the palatoglossu s muscle, which is innervated by the vague nerve (CN XJ) IV. FACE (Figure 11-3) A. The face is formed by three swellings: the frontonasal prominence, maxillaxy promi- nence (pharyngeal archP), and mandibular prominence (pharyngeal arcFTlj/ Bilateral ectodermal thickenings called nasal placodes develop on the ventrolateral aspects of the frontonasal prominence. C. The nasal placodes invaginate into the underlying mesoderm to form the nasal pits, thus producing a ridge of tissue that forms the medial and lateral nasal prominences.

D. The nasolacrimal groove forms between the maxillary prominence and the lateral nasal prominence and eventually forms the nasolacrimal duct and lacrimal sac. V. PALATE (Figure 11-4) Intermaxillary segment 1. The intermaxillary segment forms when the medial growth of rh<.' maxillary promi- nences causes the two medial nasal prominences to fus< igethei ai the midline.

Chapter 11 Week 6 Medial nasal prominence Frontonasal prominence Nasal pit Maxillary prominence 1 pharyngeal Mandibular prominence j arcn Week 10 Nasolacrimal groove Intermaxillary segment Figure 11-3. Development of the face. Note that pharyngeal arch 1 plays a major role. (Adapted from Dudek RW, Fix JD: BRS Embryology, 2 nJ ed.

Baltimore, Williams & Wilkins, 1998, p 154.) 2.

Embryology, 2nd edition is designed to: • Provide an uncomplicated review of embryology • Help equip you for the embryology questions on the USMLE Step I • Clarify difficult concepts ippincott Williams & Wilkins MM The Science of Review” ‘ 2nd edition High-Yield Embryology 2nd edition High-Yield Embryology Ronald W. Dudek, Ph.D. Full Professor Department of Anatomy and Cell Biology East Carolina University Brody School of Medicine Greenville, North Carolina JK Lippincqtt Williams & Wilkins A Wolters Kluwer Company Philadelphia • Baltimore • New York • London Buenos Aires • Hong Kong • Sydney • Tokyo Editor: Elizabeth Nieginski Editorial Director of Development: Julie P. Scardiglia Development Editors: Marjory I.

Fraser and Rosanne Hallowell Managing Editor: Marette Magargle-Smith Illustrator: Precision Graphics Marketing Manager: Kelly Ray Copyright © 2001 Lippincott Williams 6k Wilkins 351 West Camden Street Baltimore, Maryland 21201-2436 USA 530 Walnut Street Philadelphia, Pennsylvania 19106 USA All rights reserved. This book is protected by copyright. No part of this book may be reproduced in any form or by any means, including photocopying, or utilized by any information storage and retrieval system without written permission from the copy- right owner.

The publisher is not responsible (as a matter of product liability, negligence, or otherwise) for any injury resulting from any material contained herein. This publication contains information relating to general principles of medical care which should not be construed as specific instructions for individual patients. Manufacturers’ product information and package inserts should be reviewed for current information, including contraindications, dosages, and precautions. Printed in the United States of America Library of Congress Cataloging-in-Publication Data Dudek, Ronald W., 1950-.

High-yield embryology / Ronald W. Dudek.—2nd ed. p. ; cm. Includes index. ISBN 0-7817-2132-6 1. Embryology, Human—Outlines, syllabi, etc. I. Title. [DNLM: 1. Embryology—Examination Questions. 2. Embryology—Outlines. 3. Fetal Development Examination Questions. 4. Fetal Development—Outlines. QS 618.2 D845h 2000] QM601 .D83 2000 612.6’4’0076—dc21 00-059359 The publishers have made every effort to trace the copyright holders for borrowed material. If they have inadvertently overlooked any, they will be pleased to make the necessary arrangements at the first opportunity.

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