. Anatomy, descriptive and applied. Anatomy. 564 THE VASCULAR SYSTEMS to form the papillary muscles of the septum. Those of the third layer pass almost entii-ely around the left ventricle and unite with the superficial fibres from the lower half of the tendon of the conus arteriosus to form the anterior papillary muscle. Besides the layers just described there are two bands which do not end in papillary muscles. One springs from the right auriculoventricular ring and crosses in the auriculoventricular septum; it then encircles the deep laj-ers of the left ventricle and ends in the left auricul
. Anatomy, descriptive and applied. Anatomy. 564 THE VASCULAR SYSTEMS to form the papillary muscles of the septum. Those of the third layer pass almost entii-ely around the left ventricle and unite with the superficial fibres from the lower half of the tendon of the conus arteriosus to form the anterior papillary muscle. Besides the layers just described there are two bands which do not end in papillary muscles. One springs from the right auriculoventricular ring and crosses in the auriculoventricular septum; it then encircles the deep laj-ers of the left ventricle and ends in the left auriculoventricular ring. The second band is apparently confined to the left ventricle; it is attached to the left auriculoventricular ring, and encircles the portion of the ventricles adjacent to the aortic orifice. The auriculoventricular bundle of His {fasciculus atrioventricularis) (Fig. 420) is the only direct muscle ronnection known to exist between the auricles and ventricles. It arises near the opening of the coronary sinus, where it is connected with the annular and septal fibres of the right auricle. These fibres converge, form anode {node of Tawara), and continue. Fig. 420.—Schematic representation of the auriculoventricular bundle of His. The bundle, represented in red, originates near the orifice of the coronarj' sinus, undergoes slight enlargement to form a node, passes forward to the interventricular septum, and divides into two limbs. The ultimate distribution cannot be completely shown as a compact bundle which passes forward in the lower part of the pars memhranacea scpti to the upper limit of the muscle portion of the ventricular septum, and divides into right and left fasciculi. These run down to the right and left ventricles, one on either side of the inter- ventricular septum, the left limb being just covered by endocardium, while the right limb, for a part of its course, is more deeply placed in the muscle layer. Each limb is enclosed in a layer of connective
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
