MBRl'OLOGl' studies the succession of transformations undergone by the
fertilized E egg in the formation of a new individual. Development of
the embryo is directed by morphogenetic mechanisms ruled by a strict
chronology. Survival of the egg, its -transport in the genital tract,
and the adaptation of the maternal organism to its presence are
controlled by hormonal actions. Knowledge of these subjects is proving
to be increasingly important for the medical practitioner. Such
information helps to explain anatomic correlations; organ relation-
ships also illuminate the etiology of numerous pathologic conditions.
Disturbances of prenatal development engender congenital malformations
and constitute an important cause of perinatal mortality and postnatal
morbidity. We are gratef'ul to numerous student. and colleagues whose
cooperation has aided preparation of this book. THE AUTHORS.
TRANSLATOR'S PREFACE Translation of this work was undertaken in order to
make available in English this excellent and unusual aid for the
teaching arid study of mammalian, primarily human, embryology. This hook
emphasizes visual presentations. It combines the use of exceptionally
clear and instructive drawings with photomicrographs and concise but
complete text 111 an exposition of the dynamic aspects of development.
Thus, the three volumes of this book will be of help in preparation and
review for students, research workers, medical practitioners such as
obstetricians and pedia- tricians, and-others who are concerned with
embryology. Analysis of the precise timing of various stages of human
development makes it especially useful for all who are interested in the
study and prevention of congenital malformations.
