Development of the pharyngeal pouches occurs during the middle of the 9th prenatal day in Didelphis and slightly proceeds the establishment of the pharyngeal floor (McCrady 1938). Development is extremely rapid but typically mammalian in nature and by the middle of the tenth prenatal day, the head is characterized by a frontal eminence, by maxillary and mandibular processes, and by the hyoid arch (Krause and Cutts 1986). The mouth is well formed by prenatal day 11, and the oral cavity lined by stratified squamous epithelium that rests on a thin basement membrane. The lateral borders (presumptive lips) of the open mouth start to grow closed beginning at the angle of the jaws early during the 12th prenatal day. As these events occur, the lateral palatine processes unite at the midline separating oral and nasal cavities.


Parietal Cell Postnatal Period Enteroendocrine Cell Esophageal Epithelium Pyloric Gland 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • William J. Krause
    • 1
  1. 1.School of Medicine Department of Pathology and Anatomical SciencesUniversity of Missouri-ColumbiaColumbiaUSA

Personalised recommendations