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By William J. Krause

A renewed curiosity is starting to emerge spotting the possibility of marsupials as precise versions for biomedical study. as a result of their abbreviated interval of intrauterine improvement, marsupials are available versions with which to review the early improvement of mammalian organ structures. The North American opossum (Didelphis virginiana) has obtained extra medical scrutiny than the other marsupial up to now. the aim of volumes I and II is twofold. the 1st target is to attract jointly and in short summarize the morphologal occasions and helping quantitative facts desirous about the histogenesis/organogenesis of some of the organ platforms during this specific species. the second one objective is to supply an advent into the literature with reference to the biology of Didelphis virginiana and to assemble jointly a number of stories that experience considering this species. quantity I summarizes gametes and fertilization, blastocyst formation and early organogenesis, fetal membranes and placentation, parturition and migration to the pouch, basic postnatal development and improvement, and histogenesis/organogenesis of the integument, musculoskeletal approach, cardiovascular procedure, blood and blood forming organs, lymphatic organs, frightened procedure, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the respiration method, digestive process, urinary procedure, male reproductive process, lady reproductive approach, and classical endocrine system.

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Extra info for A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana)

Sample text

The duodenal (Brunner's) glands are the most unique feature ofthe submucosa and develop just distal to the gastrointestinal junction soon after birth (Krause and Leeson 1969c). The first 3 weeks of postnatal life are concerned with the establishment of an intralobular duct system, and thereafter, the majority of the secretory tubules and acini are formed. The duodenal glands form a large, lobed, glandular collar immediately distal to the pyloric sphincter (Krause and Leeson 1969b). The limited distribution and complex nature of Brunner's glands is a feature shared by most marsupial species (Krause 1972a, 1973) as well the two monotremes (Krause 1970, 1971a).

2 Juvenile Adult The lamina propria consists of a delicate connective tissue and contains numerous connective tissue cells, primarily lymphocytes, macrophages, mast cells and eosinophils. The latter may show a dramatic increase in number shortly after weaning due primarily to infestations of gastric round worms and other parasites common in the opossum (Potkay 1977). Throughout development, the submucosa consists of reticular, collagen and elastic fibers embedded in an amorphous ground substance.

Boundaries of individual islets are difficult to ascertain with certainty early in the development of the pancreas but become better defined later in the postnatal period. The number of immunoreactive endocrine cells present in the developing pancreas is shown in Table 44. During the first week of postnatal life, the number of glucagon-, 5-HT- and BPP-immunoreactive cells decrease in number, whereas the number of cells immunoreactive for insulin and somatostatin remains relatively constant. Primary (in52 terlobular) islets develop from a central area of the pancreas rich in endocrine cells in the newborn opossum (King et al.

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