By William J. Krause B.A., M.S., Ph.D., J. Harry Cutts (auth.)
This quantity studies and integrates all released morphological, developmental and quantitative info fascinated with the digestive procedure of the North American opossum, Didelphis virginiana. The overview emphasizes the developmental interrelationships among the epithelial lining of the constructing digestive process and its linked intrinsic and extrinsic glands. Pre and postnatal developmental occasions for the whole digestive approach are mentioned and offered unter seven separate headings: oral hollow space, esophagus, belly, small gut, colon, pancreas and liver.
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Additional info for Development of the Digestive System in the North American Opossum (Didelphis virginiana)
2 Muscularis Externa The muscularis extern a arises at the base of the inferior constrictor muscle of the pharynx, where it forms as a wide band of striated muscle. The outer longitudinal and inner circular layers are of equal thickness at the origin of the esophagus, but over the succeeding 2 cm the muscle layers thin out, with a greater reduction occurring in the outer layer (Marklin et al. 1979). Distal to this point, the muscularis externa progressively increases in thickness. The greatest increase occurs in the circular layer, which becomes the predominant component of the muscularis extern a (Table to).
These membrane-bound secretory granules are intimately associated with adjacent Golgi membranes and fill the apical and supranuclear cytoplasm. The mucous cells show a definite polarity, with their nuclei confined to the basal cytoplasm, where they are surrounded by profiles of granular endoplasmic reticulum. In contrast, the cytoplasm of the serous (light) cells is electron lucent and shows numerous mitochondria, scattered Golgi profiles, and occasionally structures that are believed to be secondary lysosomes.
BSex not determined. glands are the first to show subdivision into glandular and foveolar components. Parietal cells, as well as enteroendocrine cells, are present within the gastric epithelium in the fundic region of the newborn. The parietal cells lie adjacent to the underlying basal lamina and, on occasion, may border the lumen of the stomach (Fig. 18). Clefts within the gastric mucosa of the newborn opossum usually contain parietal cells at their bases. These clefts are thought to represent the initial formation of the oxyntic glands and their associated foveolae (gastric pits), which develop simultaneously in this species.
Development of the Digestive System in the North American Opossum (Didelphis virginiana) by William J. Krause B.A., M.S., Ph.D., J. Harry Cutts (auth.)