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This work is a brief review of the pre- and postnatal development
in the North American opossum (Didelphis virginiana) presented in
two volumes. Volume I summarizes gametes and fertilization,
blastocyst formation and early organogenesis, fetal membranes and
placentation, parturition and migration to the pouch, general
postnatal growth and development, and histogenesis/organogenesis of
the integument, musculoskeletal system, cardiovascular system,
blood and blood forming organs, lymphatic organs, nervous system,
eye, and ear. Volume II summarizes the histogenesis/organogenesis
of the respiratory, digestive, urinary, male and female
reproductive and classical endocrine systems.
This work is a brief review of the pre- and postnatal development
in the North American opossum (Didelphis virginiana) presented in
two volumes. Volume I summarizes gametes and fertilization,
blastocyst formationan and early organogenesis, fetal membranes and
placentation, parturition and migration to the pouch, general
postnatal growth and development, and histogenesis/organogenesis of
the integument, musculoskeletal system, cardiovascular system,
blood and blood forming organs, lymphatic organs, nervous system,
eye, and ear. Volume II summarizes the histogenesis/organogenesis
of the respiratory, digestive, urinary, male and female
reproductive and classical endocrine systems.
The North American opossum (Didelphis virginiana) generally is
regarded as an important animal, phylogenetically. It is considered
to represent a prototype marsupial and closely resembles fossil
didelphids (Tyndale-Biscoe 1973). Numerous studies concerning the
reproductive biology, embryology, and neurobiology of the opossum
have been published. More recently, Didelphis has become popular as
an animal model for gastroenterological studies because of the
remarkable anatomical and physiological similarities of the
esophagus as compared to that of man. Most of the studies of early
development have concentrated on early cleavage stages and the
formation of the three primary germ layers (Hartman 1916, 1919) and
fetal membranes (Selenka 1887; McCrady 1938). The ova of Didelphis
remain in the oviduct only for about 24 h before entering the
uterus. A corona radiata is absent and each oocyte is surrounded
only by a perivitel- line space and a zona pellucida (Talbot and
DiCarlantonio 1984). During the short transit period, the egg is
fertilized by a single spermatozoon (Rodger and Bedford 1982a,b).
This atlas presents a series of photographic illustrations and line
drawings that summarize the major developmental events that occur
during organogenesis in the opossum (Didelphis virginiana).It will
be of interest to General Biologists, Zoologists, Wildlife
Biologists, Embryologists and Medical Scientists.
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