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The Functional Structure of the Pylorus in the Ox
Author(s) -
Lauwers H.,
Ooms L.,
Simoens P.,
VOS N. R. De
Publication year - 1979
Publication title -
anatomia, histologia, embryologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.34
H-Index - 35
eISSN - 1439-0264
pISSN - 0340-2096
DOI - 10.1111/j.1439-0264.1979.tb00679.x
Subject(s) - duodenum , pylorus , anatomy , abomasum , sphincter , stomach , biology , medicine , rumen , food science , fermentation
In spite of recent electromyographic experiments and myotomy on the pylorus, a detailed morphological study of that region is still lacking. In this study the pyloric part of the abomasum and the first 15 cm. of the duodenum have been investigated macro‐ and microscopically in 20 veal calves and 20 adult cattle. The circular muscle layer of the terminal part of the pars pylorica thickens into a proximal and a distal sphincter. Two U‐shaped muscle loops, one on the visceral and the other on the parietal surface, are fixed by their base to the sphincter pylori. Together with longitudinal fibers of the abomasum and the duodenum, they may form a dilator pylori. A fibrous septum, which separates the muscular coat of the stomach from that of the duodenum is absent. Some longitudinal fibers of the abomasum are continuous with those of the duodenum. The loose mucosal folds in the pars pylorica and also the torus pyloricus may act as a mucosal plug in closing the pylorus. These findings are discussed in view of possible functional implications.