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Histological Study on the Cardiac Conducting Systems in the Atrial Portion of the Dog's Heart (II) : ON THE SPECIFIC CONDUCTING MUSCULAR FIBERS AS THE SINO-RIGHT AND SINO-LEFT ATRIAL SYSTEMS

1959; Japanese Circulation Society; Volume: 23; Issue: 6 Linguagem: Inglês

10.1253/circj1947.23.6_718

1347-4839

M Oosawa,

Cardiac Arrhythmias and Treatments

In preceding report I, the sinus node and the Tawara node were investigated histologically. This report was on the examination of the specific conducting systems to the right and left atriums from the sinus node. The materials and methods were the same as those stated in report I.Results : The findings are summarized as follows.1) The specific muscular fibers in the atrial portion are not so prominent as the sinus node, the Tawara node and Purkinje's fibers in the ventricle.2) The main pathways of the atrial portion are as follow.A) A pathway, arising from the projection of the head of the sinus node, surrounding the base of the V. cava superior.B) One of the projection of the head of the sinus node is distributed in the right atrial appendage.C) The pathway arising from the head of the sinus node along the intermediate right atrial artery near the junction of the right appendage with the right atrial body.D) The pathway arising from the tail of the sinus node along the Arteriola sini (dorsal right atrial artery) near the junction of the V. cava inferior with the right atrial body.E) In addition, the further fine branches from the above chief pathways are distributed in the anterior and posterior bodies of the right atrium.F) The above mentioned pathways are more prominent near the sinus node, not so peripherally.3) The main pathways in the left atrium : This system is found as fine muscular bundles consisting of a few muscular fibers, arising from the projections of the head of the sinus node, passing over the cava venous appendage's angle and going to the left side of the atrial septum along the Bachmann's bundle in the subendocardium and subepicardium of the right atrial wall of the aortic side. Further, the system is extended to the left atrium and distributed in the left atrial appendage and around the pulmonary veins.