A Review of Histogenesis/Organogenesis in the Developing - download pdf or read online

By William J. Krause

ISBN-10: 3540644687

ISBN-13: 9783540644682

ISBN-10: 3642722164

ISBN-13: 9783642722165

A renewed curiosity is commencing to emerge spotting the possibility of marsupials as distinct versions for biomedical study. due to 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 clinical 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 brief summarize the morphologal occasions and assisting quantitative information inquisitive about the histogenesis/organogenesis of a number of the organ structures 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 collect jointly quite a few reports that experience concerned about this species. quantity I summarizes gametes and fertilization, blastocyst formation and early organogenesis, fetal membranes and placentation, parturition and migration to the pouch, normal postnatal progress and improvement, and histogenesis/organogenesis of the integument, musculoskeletal procedure, cardiovascular method, blood and blood forming organs, lymphatic organs, fearful method, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the respiration method, digestive method, urinary approach, male reproductive method, lady reproductive procedure, and classical endocrine system.

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

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5 cm SRL) and completely disappear by the end of the third week. It appears that during the 32 Table 18. 87 (13) The numbers in parentheses indicate number of animals used. "Sex not determined. suckling period the enterocytes that line the entire small intestine, and to some extent the colon, are modified for macromolecular absorption. This modification apparently results in the delayed appearance of the intestinal glands as well as significant populations of other cell types in the small intestine.

Following a peak at birth, mitotic activity rapidly diminishes in the muscularis extema of the colon (Fig. 6). Mitotic figures are present primarily on the surfaces of the two layers of the muscularis extema in all regions of the gastrointestinal tract. The muscularis extema from all regions of the gastrointestinal tract is characterized by an early period of proliferation followed by two periods of hypertrophy (Cutts et al. 1978a). development, after weaning the muscle wall is similar in all three organs.

The period of postnatal development prior to the onset of weaning is primarily concerned with the formation of ducts, acini and islets, whereas development that occurs after weaning appears to be limited to the expansion of these established pancreatic elements (King et al. 1978). Cells immunoreactive for insulin, glucagon, BPP, somatostatin, or 5-HT are present, either as isolated cells within the exocrine tubules or as small groups of cells scattered within the central region of the pancreas of the newborn opossum.

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A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) by William J. Krause


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