By William J. Krause
A renewed curiosity is starting to emerge spotting the possibility of marsupials as specific versions for biomedical study. due to their abbreviated interval of intrauterine improvement, marsupials are obtainable versions 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 short summarize the morphologal occasions and helping quantitative information interested by the histogenesis/organogenesis of many 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 numerous stories that experience excited by 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 procedure, cardiovascular approach, blood and blood forming organs, lymphatic organs, fearful approach, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the breathing method, digestive method, urinary method, male reproductive process, 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)
Intestinal glands are not present in the small intestine of the newborn opossum and do not appear until relatively late in the postnatal period, at about the end of the seventh postnatal week (Table 20). They develop as outgrowths from the intestinal epithelium lying betwe'en villi as in other species but are short in Didelphis, even in the adult (Krause et al. 1977a). In contrast, intestinal glands of the colon, although absent in the newborn, are well established by the end of the first postnatal week and show a progressive increase in depth thereafter (Table 21).
A well-developed microvillus border characterizes the apical surface of proximal tubular cells, including those exhibiting the large apical protrusions. Basolateral infoldings are prominent. A well-developed apical endocytic complex, and large supranuclear membrane-bound vacuoles further characterize cells of the proximal tubule. The apical endocytic complex consists of a system of tubular invaginations that arise from the apical plasmalemma between the bases of microvilli. The tubules forming the endocytic complex contain an electron-dense, amorphous material.
5-cm value as the baseline. 0 Adult Body length (em) Table 13. Endocrine cell types in the stomach of developing opossum (Krause et al. 9 Relative increase a Table 14. 0 cm, 25% are at this junction. Table IS. Distribution of endocrine cells in the stomach (Krause et al. 67 29 Table 16. Absolute number of immunoreactive cells per mm 2 of mucosa of the stomach (Krause et al. 57 observed well into the postnatal period (Cutts et al. 1978a). Most dividing cells occur at the interphase between the two muscle strata, and where the inner muscle layer joins the submucosa.
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