A Review of Histogenesis/Organogenesis in the Developing by William J. Krause

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By William J. Krause

A renewed curiosity is starting to emerge spotting the possibility of marsupials as distinct types for biomedical study. as a result of their abbreviated interval of intrauterine improvement, marsupials are available types with which to review the early improvement of mammalian organ structures. The North American opossum (Didelphis virginiana) has acquired extra medical scrutiny than the other marsupial thus far. the aim of volumes I and II is twofold. the 1st objective is to attract jointly and in brief summarize the morphologal occasions and aiding quantitative facts all for the histogenesis/organogenesis of a few of the organ platforms during this specific species. the second one aim is to supply an creation into the literature in regards to the biology of Didelphis virginiana and to assemble jointly various stories that experience eager 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 method, cardiovascular process, blood and blood forming organs, lymphatic organs, anxious process, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the respiration procedure, digestive procedure, urinary procedure, male reproductive process, girl reproductive process, and classical endocrine system.

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1976). Endocrine cells immunoreactive for insulin occupy the central region of the islets. Development of the opossum pancreas occurs almost entirely during the postnatal period and the general pattern of development for both endocrine and exocrine components is typical of that reported in other mammals. 1 Pronephros The pronephros of Didelphis initially appears early during the ninth prenatal day and reaches the peak of its development at about the middle of the tenth day of embryonic life. It lies between the seventh and tenth somites and consists of five to six solid epithelial tubules that are continuous, both with the coelomic epithelium and the mesonephric (wolffian) duct (McCrady 1938).

The lobular arrangement is well established by the end of the third postnatal week and small bile ductules are seen at this time. Peaks of mitotic activity seen in hepatocytes occur at the end of the first and third postnatal weeks (Fig. 8). A subsequent increase in the total number ofhepatocytes follows each peak of mitotic activity (Fig. 8). The apparent decrease in hepatocyte number during the first week coincides with the period of high hemopoietic activity (Cutts et al. 1973). Hepatocytes attain their maximum number by the sixth postnatal week, and thereafter maintain a constant level.

40 Table 26. lmm2; mean ± SD) (Krause et al. 20 Table 27. /mm 2; mean ± SD) (Krause et al. 57 Table 28. /mm 2; mean ± SD) (Krause et al. 13 Table 29. /mm 2; mean ± SD) (Krause et al. 1989b) Organ Duodenum Proximal Distal Small intestine Seg 1 Seg2 Seg3 Seg4 . 51 Table 30. lmm2; mean ± SD) (Krause et al. 35 39 Table 31. CCK-immunoreactive cells in the intestinal tract of the developing opossum (no,lmm 2; mean ± SD) (Krause et al. 41 6. 99 Table 32. mm 2; mean ± SD) (Krause et al. 60 Table 33. mm 2; mean ± SD) (Krause et al.

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