A text-book of physiology for medical students and physicians . muscle, with, perhaps, a pause at a sino-auricularjunction, although this is uncertain. At the other end the bulbuscordis remains in the human heart as the conus arteriosus of theright ventricle, and, as we shall see, there is some evidence thatthis portion of the ventricle contracts somewhat 530 CIRCULATION OF BLOOD AND LYMPH. The matter of greatest interest in connection with the differentchambers has been the nature of the auriculoventricular the mammalian heart tendinous tissue develops in this reg
A text-book of physiology for medical students and physicians . muscle, with, perhaps, a pause at a sino-auricularjunction, although this is uncertain. At the other end the bulbuscordis remains in the human heart as the conus arteriosus of theright ventricle, and, as we shall see, there is some evidence thatthis portion of the ventricle contracts somewhat 530 CIRCULATION OF BLOOD AND LYMPH. The matter of greatest interest in connection with the differentchambers has been the nature of the auriculoventricular the mammalian heart tendinous tissue develops in this region,and for a long time it was supposed that there was no muscularconnection between auricles and ventricles. In recent years, how-ever, it has been shown most satisfactorily that there is a peculiarband of cardiac muscle or modified muscle, known usually as theauriculoventricular bundle, which connects auricle and ventricle.*The bundle as a definite structure begins at the base of the inter-auricular septum, at the posterior margin, and on the right side in. Fig. 225.—To show the position of the auriculoventricular bundle in the heart of the calf:2, The auriculoventricular bundle. As it runs along the top of the ventricular septum, it isseen to divide into two branches, one entering the right, the other the left, ventricle; 3, the begin-ning of the bundle in the auricular septum known as the A-V node; 4, the branch of the bundleentering the right ventricle in the septal wall; 1, central cartilage (Jrom Keith). a collection of small cells or fibers known as the node, or theauriculoventricular node (A-V node), it runs as a bundle along thetop of the interventricular septum (see Fig. 225), and near theunion of the posterior and median flaps of the aortic valve itdivides into two main branches, one of which enters the rightventricle, the other the left, each lying beneath the down the septal wall, these branches divide, f as repre-sented in Fig. 226, to form
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