Developmental Stages in Human Embryos
DEVELOPMENTAL STAGES IN HUMAN EMBRYOS DEVELOPMENTAL STAGES IN HUMAN EMBRYOS Including a Revision of Streeter's ''Horizons" and a Survey of the Carnegie Collection RONAN O'RAHILLY and FABIOLA MULLER Carnegie Laboratories of Embryology, California Primate Research Center, and Departments of Human Anatomy and Neurolog}', University of California, Davis CARNEGIE INSTITUTION OF WASHINGTON PUBLICATION 63T 198"7 Library of Congress Catalog Card Number 87-070669 International Standard Book Number 0-87279-666-3 Composition by Harper Graphics, Waldorf, Maryland Printing by Meriden-Stinehour Press, Meriden, Connecticut Copyright © 1987, Carnegie Institution of Washington Dem Andenken von Wilhelm His, dem Alter en, der vor hundert Jahren die Embryologie des Menschen einfuhrte und dem seines Protege, Franklin P. Mall, dem Begrunder der Carnegie Collection. Wilhelm His, 1831-1904 Fr.mkhn P. Mall, 1862-191" George L Streeter, 1873-1948 PREFACE During the past one hundred years of human embryology, three land- marks have been published: the Anatomie der menschlichen Embryonen of His (1880-1885), the Manual of Human Embryology by Keibel and Mall (1910-1912), and Streeter's Developmental Horizons in Human Embryos (1942-1957, completed by Heuser and Corner). Now that all three milestone volumes are out of print as well as in need of revision, it seems opportune to issue an updated study of the staged human embryo. The objectives of this monograph are to provide a reasonably detailed morphological account of the human embryo (i.e., the first eight weeks of development), a formal classification into developmental stages, a catalogue of the preparations in the Carnegie Collection, and a reference guide to important specimens in other laboratories.
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