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Histology of the Gastro-Esophageal Junction in Certain Microtine Rodents

Lyle C. Dearden
Journal of Mammalogy
Vol. 47, No. 2 (May, 1966), pp. 223-229
DOI: 10.2307/1378118
Stable URL: http://www.jstor.org/stable/1378118
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Histology of the Gastro-Esophageal Junction in Certain Microtine Rodents
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Abstract

The gastro-esophageal junction in four genera of microtine rodents (28 specimens) has been investigated from their gross and histological aspects. The cardiac sphincter is composed of both smooth and striated muscle and extends, by means of the corpopyloric fold, from above the cardiac orifice to well below it. The combination of longitudinal striated muscle, smooth circular muscle and striated circular muscle, produces a more extensive closing mechanism at the cardiac orifice than occurs in other mammals in which this junction has been studied. The sphincteric muscle action when coupled with the modifications of the cornified stratified squamous epithelium at the cardia, produces a tight seal at the cardiac orifice. The area of transition from the esophageal-type epithelium to the gastric mucosa in the pyloric portion of the stomach of the four genera is discussed.

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