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

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By William J. Krause

A renewed curiosity is commencing to emerge spotting the potential for marsupials as exact versions for biomedical study. due to their abbreviated interval of intrauterine improvement, marsupials are available types with which to review the early improvement of mammalian organ platforms. The North American opossum (Didelphis virginiana) has obtained extra clinical 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 assisting quantitative info inquisitive about the histogenesis/organogenesis of a few of the organ platforms during this specific species. the second one objective is to supply an creation into the literature in regards to the biology of Didelphis virginiana and to collect jointly quite a few experiences that experience curious about 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, anxious process, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the breathing approach, digestive method, urinary process, male reproductive approach, girl reproductive process, and classical endocrine system.

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The cytoplasm contains scattered mitochondria, free ribosomes and occasional proffies of granular endoplasmic reticulum. The morphological features of the mesonephroi remain unchanged from those of the newborn for 4 days into the postnatal period. 5 cm SRL), the mesonephros appears slightly curved and shrunken at its cranial pole. Nephrons within the cranial pole show varying degrees of regression. They often appear collapsed and their lumina become filled with dense-staining material. In contrast, nephrons within the caudal pole of the mesonephros appear normal and apparently are functional.

Unlike other enteroendocrine cell types, they follow a distal to proximal progression in their distribution as they increase in number in the small intestine with age (Krause et al. 1989b). Neurotensin-immunoreactive cells, although observed in the proximal colon of the newborn opossum, do not form a significant population until 75 days postnatal, and then are distributed throughout the colon. They increase in numbers with development and show a greater concentration distally (Table 35). ' Enteroendocrine cells within the intestinal epithelium of the developing and adult opossum, although randomly scattered, tend to occur as small clusters of cells expressing similar immunoreactivity (Krause et al.

140u... 3: .... 100 cu Q. VI Qj 60 U 20 1·5 2·5 4·5 7·5 10·0 15·5 20·0 Body length (em) Fig. 8. Quantitative data for hepatoeytes. (top) The number of mitotic and binucleate hepatocytes per 1,000 cells at various stages of development. (bottom) The number of hepatic cells per high power field at each stage of development. (Cutts et al. 1973) (Cutts et al. 1978a). As in other species, the myenteric plexus consists of ganglia and intersecting nerve fascicles (Christensen et al.

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