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 facts excited by the digestive approach of the North American opossum, Didelphis virginiana. The evaluation 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 full 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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Extra resources for Development of the Digestive System in the North American Opossum (Didelphis virginiana)

Example text

These arise together as invaginations of the gastric epithelium (Table 22). Both components differentiate and develop simultaneously, and by the time of weaning the foveolae are fully developed and the glands are well established (Acuff et al. 1989). The depth of the cardiac glands increases more rapidly than that of the foveolae so that, just prior to the onset of weaning, glands are almost twice as long as are the foveolae. At weaning, the cardiac glands have attained their adult appearance and frequently are organized into small lobule-like complexes.

1982). To date, the literature contains no information concerning the localization and/or synthesis of factors such as neural growth factors (NGF), EGF, renin, or other products that are thought to be secreted by the salivary glands and to be involved in regulating the development and function of the digestive system. EGF and NGF are found in high concentrations in the submandibular glands of other species (Murphy et al. 1979, 1980, 1981; Steidler and Houghton 1980). EGF is thought to stimulate the gastrointestinal mucosa and tissues within the oral cavity (Liebow 1989).

1982). 38 Table 13. Distribution of motor end plates in the muscularis extema in the opossum and human esophagus (ShedlofskyDeschamps et al. 0 No. 11 A lower esophageal sphincter has been demonstrated manometrically (Tuch and Cohen 1973) and pharmacologically, (Christensen 1970) and studies using the opossum esophagus have provided abundant data about this region (Asoh and Goyal 1978a; Christensen 1982; Christensen et al. 1973a,b, 1979, 1987a, 1989; Christensen and Percy 1984; Christensen and Roberts 1983; Cohen and DiMarino 1976; Cohen and Green 1973; Daniel et al.

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