The microangioarchitecture of the conducting system in cattle.
Macroscopic researches on heart vascularization have indicated that the angioarchitecture of the conducting system differs from that of the normal myocardium. In order to observe this variance, eight cow hearts were dissected for perfusion through the Ramus ventricularis dexter and Ramus septalis of the A. coronaria dextra with Ringer's solution, and then injected with Mercox. After corrosion in KOH the casts were prepared for observation in a SEM. In the region of the sinoatrial node no special capillary arrangement was observed, but only valves on the venous side. At the atrioventricular node and the bundle of His, the arterioles showed a diffuse formation, filling this area with a regular caliber, without any special capillary orientation. The arteries that reach the right bundle dichotomized and ran collateral to the opposite extremity of this structure, lying parallel. The vessels with the biggest caliber were deeply positioned. In the left bundle the arterioles showed a net like figure, mainly in one plane. Following the form of the bundle, and below the conducting tissue a big anastomotic venous arrangement is observable.
Teixeira
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AF
Institute of Biology, Federal University of Pelotas, Brazil.
Szabo
K
K
König
B
B
D000818:Animals; D002196:Capillaries / Q000648:ultrastructure*; D002417:Cattle / Q000033:anatomy & histology*; D003331:Coronary Vessels / Q000648:ultrastructure*; D007091:Image Processing, Computer-Assisted