cens cordis. D
8 Sinoatrial (SA) node. Nodus sinuatralis [[Keith-Flack sinus node]]. Ribbon-like specialized cardiac muscle situated in front of the entrance of the superior vena cava. It represents the primary impulse formation center (pacemaker) which determines the rhythm of the heart. D
9 Atrioventricular (AV) node. Nodus atri-oventricularis [[node ofAschoff-Tawara]]. Small complex ofspecialized cardiac muscle fibers in the interatrial septum below the fossa ovalis and in front of the opening of the coronary sinus. After a latency period, the impulse transmitted to it myogenically from the SA node is conducted further into the ventricle via the bundle of His and its crura. In case of SA node failure the AV node can take over the control of heart rhythm as a secondary pacemaker. D
10 Atrioventricular (AV) bundle. Fasciculus atri-oventricularis. Bundle of impulse-conducting fibers between the AV node and the papillary muscles. D
11 Trunk [[bundle of His]]. [[truncus]]. Initial segment of the AV bundle that extends up to the site where it divides into a right and left crus at the membranous part of the septum. D
12 Crus (dextrum/sinistrum). Right/left crus of the impulse-conducting system which extends right and left into the interventricular septum as far as the papillary muscles where they both ramify. D
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