The endoderm consists of a single layer of cuboidal cells that lines the flattened interior surface of the developing opossum embryo until about the middle of the 9th day of gestation (Krause and Cutts 1985b). Just after the formation of the branchial pouches and pharyngeal membranes at the end of the 9th day of gestation, the first trace of the foregut appears, beginning as a minute diverticulum in the floor of the pharynx. The lungs also develop as endodermal outgrowths from this newly formed, endodermal-lined tube, and early in day 10, the esophagus is established as an independent entity (McCrady 1938).


Lower Esophageal Sphincter Alcian Blue Vasoactive Intestinal Polypeptide Myenteric Plexus Ciliated Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • William J. Krause
    • 1
  • J. Harry Cutts
    • 1
  1. 1.Department of Anatomy and NeurobiologySchool of Medicine, University of MissouriColumbiaUSA

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