The Gastric Mucosa
نویسنده
چکیده
THE gastric mucous membrane is described as being disposed in three regions, known as the cardiac, fundic, and pyloric. These regions, although distinguished from one another by definite microscopic characters, yet merge gradually the one into the other, so as to present no well-defined lines of demarcation. The actual extent of each region varies in different animals. It has not been sufficiently recognized, however, that the cardiac and pyloric areas are very small, especially in the carnivora. In the cat, the (microscopic) pyloric region is a narrow zone, extending for not more than 35 mm. from the junction of pylorus and duodenum ; it may not even correspond in extent with the so-called pyloric ant ruin. In view of this fact it is possible to doubt the exactness with which pure pyloric pouches can be isoLated either by the Heidenhain (13) or Pavlov (21) technique. What is known regarding the functions of the different regions of the stomach is not compatible with their differences in structure. And current descriptions of the cells forming the gastric glands are by no means uniform, much confusion being due to the fact that the histological descriptions vary according to the method of fixation and staining employed and the species of animal investigated. The following description of the histology of the gastric glands is divided into three parts. In Part I only the gastric mucosa of the cat will be described, since the observations
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