Book - A Laboratory Manual and Text-book of Embryology
of
EMBRYOLOGY
By
CHARLES WILLIAM PRENTISS, A. M., Ph. D.
LATE PROFESSOR OF MICROSCOPIC ANATOMY, NORTHWESTERN UNIVERSITY MEDICAL SCHOOL, CHICAGO
Revised and Extensively Rewritten by
LESLIE BRAINERD AREY, Ph. D.
ASSOCIATE PROFESSOR OF ANATOMY IN THE NORTHWESTERN UNIVERSITY MEDICAL SCHOOL, CHICAGO
SECOND EDITION, ENLARGED
WITH 388 ILLUSTRATIONS
MANY IN COLOR
PHILADELPHIA AND LONDON
W. B. SAUNDERS COMPANY
1918
Copyright, I915, by W. B. Saunden Company. Reprinted August. 1915. Revised, entirdy
reset, reprinted, and recopyrighted October. 1917
Copyright. 1917. by W. B. Saunders Company
Reprinted July. 1918
Charles William Prentiss (1874 - 1915)
Preface to the Second Edition
The untimely death of Professor Prentiss has made necessary the transfer of his Embryology* into other hands. In this second edition, however, the general plan and scope of the book remain unchanged although the actual descriptions have been extensively recast, rewritten, and rearranged. A new chapter on the Morphogenesis of the Skeleton and Muscles covers briefly a subject not included hitherto. Forty illustrations replace or supplement certain of those in the former edition.
In preparing the present manuscript a definite attempt has been made to render the descriptions as clear and consistent as is compatible with brevity and accuracy. It has likewise been essayed to properly evaluate the embryological contributions of recent years, and, by incorporating the fundamental advances, to indicate the trend of modern tendencies. Since no page remains in its entirety as originally penned by Professor Prentiss, the reviser must assume full responsibility for the subject-matter as it now stands.
It is hoped that those who read this text will co-operate with the writer by freely offering criticisms and suggestions.
L. B. A.
Chicago
Preface
This book represents an attempt to combine brief descriptions of the vertebrate embryos which are studied in the laboratory with an account of human embryology adapted especially to the medical student. Professor Charles Sedgwick Minot, in his laboratory textbook of embryology, has called attention to the value of dissections in studying mammalian embryos and asserts that "dissection should be more extensively practised than is at present usual in embryological work" The writer has for several years experimented with methods of dissecting pig embryos, and his results form a part of this book. The value of pig embryos for laboratory study was first emphasized by Professor Minot, and the development of my dissecting methods was made possible through the reconstructions of his former students. Dr. F. T. Lewis and Dr. F. W. Thyng.
The chapters on hiunan organogenesis were partly based on Keibel and Mall's Human Embryology. We wish to acknowledge the courtesy of the publishers of Kollmann's Handatlas, Marshall's Embryology, Lewis-Stohr's Histology and McMurrich's Development of the Human Body, by whom permission was granted us to use cuts and figures from these texts. We are also indebted to Professor J. C. Heisler for permission to use cuts from his Embryology, and to Dr. J. B. De Lee for several figures taken from his *' Principles and Practice of Obstetrics." The original figures of chick, pig and hiunan embryos are from preparations in the collection of the anatomical laboratory of the Northwestern University Medical School. My thanks are due to Dr. H. C. Tracy for the loan of valuable human material, and also to Mr. K. L. Vehe for several reconstructions and drawings.
C. W. Prentiss.
Northwestern University Medical School.
