1909.] The Nerves of the Atrio -ventricular Bundle. 163 



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EXPLANATION OF PLATES. 



A.V.B. = atrio-ventricular bundle. C.S. = coronary sinus. 



R.B. = right branch of A.V.B. M; = muscle. 



L.B. = left branch of A.V.B. G. = ganglion cell. 



B. = bifurcation. 



Plate 4. 



Fig. 1. — Dissection of right atrium and -ventricle of calf to show A.V.B. The band is 

 seen passing from under atrial muscle near C.S. to B., then continued under 

 medial cusp over right ventricular septum at R.B. towards the insertion of 

 moderator band (M.B.). 



V.C.I. = inferior vena cava. M.C. = medial cusp. 



A. = auricle. A.C. = anterior cusp. 



Fig. 2. — A.V.B. of calf looking down from above. The great portion of atrium has been 

 removed to show bifurcation in the upper part of ventricular septum. 



R.V.S. 

 L.V.S. 



= right ventricular septum. 

 = left ventricular septum. 



