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Histological Study on the Cardiac Conducting Systems in the Atrial Portion of the Dog's Heart (3) : ON THE SPECIFIC PATHWAYS CONDUCTED BETWEEN THE SINUS NODE AND THE TAWARA NODE

1959; Japanese Circulation Society; Volume: 23; Issue: 7 Linguagem: Inglês

10.1253/circj1947.23.7_1014

1347-4839

M Oosawa,

Cardiovascular Function and Risk Factors

The sinus node, the Tawara node and the sino-right and sino-left atrial systems were studied in the preceding report I and II. This report was carried out on the examination of the specific pathways connected between the sinus node and the Tawara node. The materials and methods were as same as that were stasted in report I.Results : The main pathways are summarized as follows.1) This system is named "Systema septo-angularis anterior".Namely, this system, arising from the projection of the head of the sinus node, passing over the cava venous appendage's angle, along the subendocardium in the Bachmann's bundle of the aortic side, arriving at the upper point of the angle of junction of the anterior right atrial septum with the right atrial body in the aortic side, descending along this angle, and then connecting with the main part of the Tawara node.2) This system is named "Systema septisinistra".Namely, this system, arising from the projection of the head of the sinus node, passes with the Systema septo-angularis anterior, arriving at the upper part of the later, further crossing the atrial septum to the left septal side. Also, it builds a small muscular bundle at the left atrial septum, and runs obliquely under and back in the subendocardium of the left atrial septum. After that, it connects with the left atrial bundle near the transitional part between the left atrial septum and the left posterior atrial body. Finally, it connects with the head side of the Tawara node by way of the left atrial bundle.3) This system is named "Systema septo-angularis posterior".Namely, this system, arising from the tail part of the sinus node, passes around the posterior body over the cava venous angle, entering into the right atrial septum in the upper part of the Torus Loweri, descending in the subendocardium of the posterior side of the right atrial septum near the junction of the atrial septum with the right atrial body, surrounding the coronary sinus under the Valvula Eustachi. Then, passing obliquely under and front, it connects with the head of the Tawara node.4) This system is named "Systema dextro-atrii caudalis".Namely, this system, arising from the tail part of the sinus node, descends along the Arteriola sini in the subepicardium of the anterior wall of the right atrial body, passing around the posterior side appoximately at the angle between the anterior body and the V. cava inferior in the level of the atrioventricular orifice. It then cnnects with the head of the atrial septum under the coronary sinus.5) The pathways connected with the head of the Tawara node are named "Right atrial bundle" and "Left atrial bundle".The right atrial bundle consists of the union with the Systema septo-angularis posterior and Systema dextro-atrii caudalis. This bundle situates at the subendocardium of the right atrial septum from the under part of the coronary sinus to the head of the Tawara node. The left atrial bundle connects with the Systema septi sinistra, and is situated at the subendocardium of the left atrial septum from the posterior part of the left atrial septum to the head of the Tawara node.6) In the Torus Loweri reported by Monckeberg or Scherf, the specific muscular fibers were not found.7) The so-called second node stated by Freund, Fukuhara and Takahashi was not observed.