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

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 opportunity of marsupials as specific types for biomedical examine. 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 bought extra medical scrutiny than the other marsupial up to now. the aim of volumes I and II is twofold. the 1st aim is to attract jointly and in short summarize the morphologal occasions and aiding quantitative facts curious about the histogenesis/organogenesis of a number of the organ structures during this specific species. the second one aim is to supply an advent into the literature in regards to the biology of Didelphis virginiana and to assemble jointly quite a few reviews that experience fascinated 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 progress and improvement, and histogenesis/organogenesis of the integument, musculoskeletal approach, cardiovascular approach, blood and blood forming organs, lymphatic organs, fearful procedure, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the breathing process, digestive process, urinary approach, male reproductive process, woman reproductive method, and classical endocrine system.

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Sample text

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.

9 Pancreas The dorsal anlage of the pancreas evaginates from the foregut late in the tenth prenatal day but by late in the 11th prenatal day, its connection with the foregut disappears. The ventral pancreatic anlage originates as a branch of the hepatic diverticulum during prenatal day 11, and just prior to birth ventral and dorsal pancreatic anlagen unite. The resulting pancreas is connected to the proximal duodenum by a single duct derived from the ventral anlage (McCrady 1938). Postnatal growth of the pancreas, as indicated by total wet weight, is shown in Table 42.

Relative to body weight, the weight of the gut remains constant during the first two postnatal weeks, declines slightly, then markedly increases at 60 days postnatal (10 cm SRL) (Table 19). Following this period of growth, the weight of the gut tube remains fairly constant. The luminal diameter of the proximal small intestine from the newborn opossum is considerable, whereas that of the distal segments is quite narrow (Krause et al. 1977a). Villi are better developed and more mature in appearance proximally (Fig.

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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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