Development of the Digestive System in the North American by William J. Krause B.A., M.S., Ph.D., J. Harry Cutts (auth.)

By William J. Krause B.A., M.S., Ph.D., J. Harry Cutts (auth.)

This quantity reports and integrates all released morphological, developmental and quantitative information taken with the digestive method of the North American opossum, Didelphis virginiana. The evaluate emphasizes the developmental interrelationships among the epithelial lining of the constructing digestive method and its linked intrinsic and extrinsic glands. Pre and postnatal developmental occasions for the total digestive procedure are mentioned and provided unter seven separate headings: oral hollow space, esophagus, abdominal, small gut, colon, pancreas and liver.

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22). Enteroendocrine cells also are numerous in pyloric glands, as can be seen after staining by the ChurunkianShenk silver method (Acuff et al. 1989). The enteroendocrine cells within the pyloric region of postweaned opossums tend to form a narrow band of cells, closely crowded together at the base of the foveolae and in the neck segments of the glands (Fig. 23). The ultrastructural morphology of the enteroendocrine cells varies according to the specific type, but all generally show an electron-lucent cytoplasm, occasional profiles of granular endoplasmic reticulum, and scattered secretory granules whose morphology depends on the cell type observed.

Generally, the distribution of gal an in parallels that of VIP but was not observed in the striated musculature or associated with 40 Table 15. Density of ganglia along the esophageal body and sphincter (Christensen and Robison 1982) Segment position a 3 cm above LES 2 cm above LES LES Mean ± 1 SE (ganglia/cm2) Animal number 75 47 48 2 3 4 5 65 47 33 54 43 25 61 57 23 51 46 21 61 ± 4b 48 ± 2c 30 ± 5 LES, lower esophageal sphincter. 05). 05). a Table 16. Density of perikarya along the esophageal body and sphincter (Christensen and Robison 1982) Segment position a 3 cm above LES 2 cm above LES LES Mean ± 1 SE (cells/cm2) Animal number 906 679 333 2 3 4 5 1176 660 172 600 321 79 772 570 234 636 414 141 818 ± 105b 529 ± 70c 192 ± 43 LES, lower esophageal sphincter.

Striated, mixed, and smooth muscle in the muscularis extern a of the adult opossum (Marklin et aJ. 0 Table 12. Histochemical classification of fiber types in the striated muscle of the opossum and human esophagus (Shedlofsky-Deschamps et aJ. 3 PAS Human Dubowitz-Brooke classification (1973) Type I Type lIA Type lIB Intermediate Intermediate Intermediate to weak Intermediate to weak Strong Strong Intermediate Intermediate Weak Weak Strong No reaction No reaction Strong Strong Strong No reaction Intermediate Weak Strong Strong Intermediate Strong No reaction No reaction Strong Strong Strong No reaction Intermediate SDH, succinic acid dehydrogenase; NADH, nicotinamide adenine dinucleotide dehydrogenase; ATPase, adenosine triphosphatase; PAS, periodic acid-Schiff reagent.

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