By William J. Krause
A renewed curiosity is commencing to emerge spotting the opportunity of marsupials as designated versions for biomedical study. due to their abbreviated interval of intrauterine improvement, marsupials are available types with which to check the early improvement of mammalian organ structures. The North American opossum (Didelphis virginiana) has got 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 brief summarize the morphologal occasions and assisting quantitative facts fascinated with the histogenesis/organogenesis of a few of the organ platforms 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 experiences that experience desirous 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 procedure, cardiovascular approach, blood and blood forming organs, lymphatic organs, anxious process, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the respiration procedure, digestive process, urinary approach, male reproductive process, lady 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)
1978a). Hypertrophy is a major factor in establishing the total thickness of the stomach muscle wall and begins immediately following the period of proliferation (the first four postnatal weeks). The rate of expansion of the muscularis externa is about three times as great as the preceding 4 weeks due to the hypertrophy of the smooth muscle. The muscularis externa undergoes a second increase in thickness that occurs during the period from weaning to adulthood (Cutts et al. 1978a). The overall rate of development is shown in Table 17.
1978). Islets are poorly defined and the exocrine tubules end as solid clusters of undifferentiated cells, among which scattered endocrine cells and pro acinar cells are observed. Cells that comprise the remainder of the exocrine tubules are smaller than proacinar cells and range from simple squamous to simple columnar. Regions of stratification also occur in the epithelium of the exocrine tubules and exhibit numerous mitotic figures. Such regions represent peritubular buds that characterize the pancreas through the first postnatal weeks, and will eventually differentiate into endocrine and exocrine components of the pancreas.
Cells comprising the proximal mesonephric tubules are large and pyramidal in shape. Cell apices often are in the form oflarge dome-shaped cytoplasmic protrusions that extend into the lumen of the tubule. Tight junctions unite cell apices around an irregularly shaped lumen. 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.
A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) by William J. Krause