MUSCULATURE AND MYENTERIC PLEXUS
One of the interesting facts about the physiology of the gastro-intestinal tract is that peristaltic waves coursing over the stomach seem to stop at the pylorus or a few centimeters above it. Many investigators (Joseph and Meltzer,1 Wheelon and Thomas,2 Alvarez and Mahoney,3 Payne and Poulton4 and Ivy and Vloedman5) have frequently observed tonus waves in the duodenum as the gastric wave approached the pylorus. At times it seems as if the gastric waves actually jump the pyloric barrier and extend down the duodenum as peristaltic rush waves (Alvarez6). And yet, the best evidence points to the fact that the duodenal waves originate in the first part of the duodenum and are not propagated gastric waves which have jumped the pyloric barrier (Cole7 and Alvarez). Why do not the gastric waves go on down the bowel, and why are
HORTON BT. PYLORIC BLOCK: WITH SPECIAL REFERENCE TO THE MUSCULATURE, MYENTERIC PLEXUS AND LYMPHATIC VESSELS. Arch Surg. 1931;22(3):438–462. doi:10.1001/archsurg.1931.01160030089006
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