By William J. Krause
A renewed curiosity is starting to emerge spotting the potential for marsupials as distinct versions for biomedical learn. due to their abbreviated interval of intrauterine improvement, marsupials are obtainable versions with which to check the early improvement of mammalian organ platforms. The North American opossum (Didelphis virginiana) has got extra medical scrutiny than the other marsupial to this point. the aim of volumes I and II is twofold. the 1st target is to attract jointly and in short summarize the morphologal occasions and assisting quantitative info interested in the histogenesis/organogenesis of a few of the organ structures during this specific species. the second one target is to supply an advent into the literature with reference to the biology of Didelphis virginiana and to collect jointly various 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 progress and improvement, and histogenesis/organogenesis of the integument, musculoskeletal approach, cardiovascular method, blood and blood forming organs, lymphatic organs, apprehensive process, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the breathing process, digestive approach, urinary process, male reproductive method, woman reproductive approach, and classical endocrine system.
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Additional info for A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana)
All show a marked increase in number by the end of the first postnatal week (Krause et al. 1986). Glucagon- and BPP-immunoreactive cells are confined primarily to the oxyntic glands throughout development, and their numbers following the first postnatal week decline with age (Tables 13, 14). Gastrinimmunoreactive cells show the most prominent increase early and are restricted to the pyloric glands. The populations of somatostatin- and serotonin-immunoreactive cells shift from the fundic and cardiac regions to the pyloric region of the stomach, attaining an adult distribution of these cell types soon after weaning (Tables 15, 16).
140u... 3: .... 100 cu Q. VI Qj 60 U 20 1·5 2·5 4·5 7·5 10·0 15·5 20·0 Body length (em) Fig. 8. Quantitative data for hepatoeytes. (top) The number of mitotic and binucleate hepatocytes per 1,000 cells at various stages of development. (bottom) The number of hepatic cells per high power field at each stage of development. (Cutts et al. 1973) (Cutts et al. 1978a). As in other species, the myenteric plexus consists of ganglia and intersecting nerve fascicles (Christensen et al. 1983). 8 Liver The hepatic diverticulum arises from the foregut in the midventralline during the tenth prenatal day in Didelphis, and by early in the 11 th embryonic day, cords of cells extend from the hepatic duct into the mesenchyme of the ventral mesentery (McCrady 1938).
With regard to sex of the animals. The liver then shows a marked increase in weight during the postweaning period. However, relative to body weight, the liver progressively decreases in weight after the third postnatal week (Table 41), and it is not until weaning that weights comparable to those of adults are obtained (Krause and Cutts 1992). Although hepatocytes are concentrated around central veins in the newborn, they show no organization into plates. Clusters of hepatocytes appear separated by large islands of hemopoietic cells (Krause et al.
A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) by William J. Krause