By William J. Krause
A renewed curiosity is starting to emerge spotting the possibility of marsupials as designated versions for biomedical learn. due to their abbreviated interval of intrauterine improvement, marsupials are obtainable types with which to check the early improvement of mammalian organ structures. The North American opossum (Didelphis virginiana) has obtained extra medical scrutiny than the other marsupial so far. 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 fascinated by the histogenesis/organogenesis of some of the organ platforms during this specific species. the second one target is to supply an creation into the literature with reference to the biology of Didelphis virginiana and to assemble jointly numerous experiences that experience interested by 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 process, cardiovascular procedure, blood and blood forming organs, lymphatic organs, fearful approach, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the breathing process, digestive method, urinary process, male reproductive procedure, 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)
1973). Hepatocytes attain their maximum number by the sixth postnatal week, and thereafter maintain a constant level. It is at this time that individual lobules and periportal areas are clearly defined, however, it is not until after weaning that the liver assumes an adult appearance. The architecture of the liver is typically mammalian. The liver during the latter part of the postnatal period (50-85 days postnatal) also undergoes major metabolic and physiological changes. An increase in the activities of the isoenzymes, lactate and malate dehydrogenase (Renfree and Fox 1975), as well as hepatic cytochromes (Neims et al.
1979a) Body length (em) Age (days) Weight of paired mesonephroi a No. 5 15 aMean in grams ± SD. the proximal mesonephric tubule. Cells of the parietal layer of Bowman's capsule exhibit an irregular basal surface and lie on a distinct, continuous basal lamina. A delicate connective tissue stroma separates adjacent mesonephric corpuscles. Podocytes form the viscerallayer of Bowman's capsule and closely resemble those described in metanephric renal corpuscles of a variety of different species, including man.
Mitotic activity within the oxyntic mucosa also is greatest during the first few weeks of postnatal life. In contrast, serotonin- and somatostatin -immunoreactive cells do not establish adult numbers and position within the pyloric glands until weaning. 80 100 130 220 Body length (cm) Fig. 5. (top) The number of parietal and chief cells calculated per mm 2 of gastric mucosa during postnatal development. Initially, some parietal cells are found scattered within the surface lining epithelium. These parietal cells are shown by the area encompassed by diagonal lines.
A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) by William J. Krause