Download PDF by William J. Krause: A Review of Histogenesis/Organogenesis in the Developing
By William J. Krause
A renewed curiosity is commencing to emerge spotting the potential for marsupials as particular versions 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 platforms. The North American opossum (Didelphis virginiana) has bought extra clinical 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 brief summarize the morphologal occasions and aiding quantitative info taken with the histogenesis/organogenesis of some of the organ platforms during this specific species. the second one aim is to supply an creation into the literature with reference to the biology of Didelphis virginiana and to assemble jointly a number of reviews that experience fascinated with this species. quantity I summarizes gametes and fertilization, blastocyst formation and early organogenesis, fetal membranes and placentation, parturition and migration to the pouch, common postnatal development and improvement, and histogenesis/organogenesis of the integument, musculoskeletal approach, cardiovascular approach, blood and blood forming organs, lymphatic organs, worried approach, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the breathing method, digestive method, urinary method, male reproductive method, girl reproductive method, and classical endocrine system.
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Extra resources for A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana)
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.
It contains connective tissue cells normally associated with loose connective tissue. Neurons of the submucosal plexus are poorly developed in the newborn but rapidly increase in size and number through the first four postnatal weeks. Thereafter, the neurons of this plexus appear to form a fairly stable population. The muscularis extern a of the newborn consists of a thin layer of myoblasts, two to three cells thick, incompletely separated into inner and outer layers (Cutts et al. 1978a). The inner layer forms a complete investment around the stomach, whereas the outer layer appears discontinuous and is formed by a single layer of scattered myoblasts.
All show a marked increase in number by the end of the first postnatal week (Krause et al. 1986). Glucagon- and BPP-immunoreactive cells are confined primarily to the oxyntic glands throughout development, and their numbers following the first postnatal week decline with age (Tables 13, 14). Gastrinimmunoreactive cells show the most prominent increase early and are restricted to the pyloric glands. The populations of somatostatin- and serotonin-immunoreactive cells shift from the fundic and cardiac regions to the pyloric region of the stomach, attaining an adult distribution of these cell types soon after weaning (Tables 15, 16).
A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) by William J. Krause