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RUSKIN M. LHAMON 



the left branch to the region where this divides at about the junc- 

 tion of the upper and middle thirds of the septum. From here, 

 three main paths lead off; an anterior which traversed a false 

 tendon to reach a papillary muscle, a middle which passed down 

 to branch out upon the septal wall as far as the apex, and a pos- 

 terior which crossed a false tendon to reach the base of the pos- 



Fig. 1 Photograph of ox heart, retouched, showing injected sheath of atrio- 

 ventricular bundle. One-half actual size. 1 and 2, points from which entire left 

 side of sheath was injected; 3 and 4, a cut false-tendon, connecting the septal 

 with the outer wall of the chamber; 5, marks the region above apex, where a very 

 fine anastomosis is not well represented in the photograph. 



terior papillary muscle. On the septal wall, the whole sheath 

 was injected from the one point 1. In the same way the system 

 of branches on the outer wall of the ventricle was filled from 

 point 2. The false tendon connecting points 3 and 4 was after- 

 ward cut to facilitate photographing the specimen. At 5 two 

 tendon threads are shown which carry Purkinje fasciculi, but the 

 sheaths of these were not completely injected. 



