Abstract
To elucidate motor function of the pylorus, manometric and electromyographic studies were carried out on the canine stomach following transection and end-to-end anastomosis at various levels such as proximal 1/3, 1/2, distal 1/3, distal 1/4. and at 4, 3, 2, and 1cm proximal to the pyloric ring.
Transections at the body of the stomach caused slight or no increase in contrac-tion pressure of the pylorus, a slight increase in the incidence of anti-peristalsis and slight or no prolongation of the discharge interval. On the other hand, transection at the borderline between the corpus and antrum of the stomach resulted in a marked increase in contraction pressure of the pylorus, a marked increase in the incidence of anti-peristalsis and a marked prolongation of the discharge interval. The results suggested excitation of the pylorus. As the level of transec-tion approached the pyloric ring, the electromyogram taken from the pylorus showed the evidence of excitation but the contraction pressure of the pylorus gradually lowered, probably because of a small amount of muscular remnant in the pyloric portion. The contraction pressure of the pylorus was approximately equal to the control value when a transection was made at 1.5 to 2.0cm proximal to the pyloric ring.
