By William J. Krause
This paintings is a quick overview of the pre- and postnatal improvement within the North American opossum (Didelphis virginiana) offered in volumes. quantity I summarizes gametes and fertilization, blastocyst formation and early organogenesis, fetal membranes and placentation, parturition and migration to the pouch, basic postnatal development and improvement, and histogenesis/organogenesis of the integument, musculoskeletal procedure, cardiovascular method, blood and blood forming organs, lymphatic organs, apprehensive process, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the respiration, digestive, urinary, female and male reproductive and classical endocrine platforms.
Read or Download A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) (Advances in Anatomy, Embryology and Cell Biology) (Vol I) PDF
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Additional resources for A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) (Advances in Anatomy, Embryology and Cell Biology) (Vol I)
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.
6 0 0 0 I I I ' /~ ' I B or.. ',/(' , ' 'n ueleate' ,.. ,' ...... -------- ...... -:.. -::. -~ 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.
Ultrastructural and histochemical assessments suggest that the membranes consist of collagen-like proteins and neutral glycoproteins of unknown composition (Krause and Leeson 1969a). 69 *Occasional cell present. 04. 45 30 cm Table 38. Absolute number of immunoreactive cells per mm 2 of mucosa (Krause et al. 4 100 "Occasional cell present CCK Glucagon Gastrin BPP Somatostatin. 8 30 cm * 20cm Table 39. Percentage of immunoreactive cells in each area (Krause et al. 6 Mid Distal colon colon fill the interstices between the two, resulting in a thick, complete sleeve of connective tissue cells that surrounds the intestinal lumen throughout its length.