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. 1978 Aug 25;192(1):77-87.
doi: 10.1007/BF00231024.

Ultrastructure of capillaries in the conduction system of the heart in various mammals

E Weihe, P Kalmbach

Ultrastructure of capillaries in the conduction system of the heart in various mammals

E Weihe et al. Cell Tissue Res. .

Abstract

The capillaries in the atrioventricular node and atriventricular bundle of the heart (mammals) were investigated by thin sections and freeze-etch replicas. Fenestrated endothelial cells were found to occur in all mammals examined in this study. These fenestrations (500 +/- 50 A diameter) are bridged by a diaphragm and occur in relatively small sieve areas. In contrast to the AV-node and AV-bundle, the non-specialized myocardium is supplied by continuous capillaries. The presence of the fenestrated capillary in the conduction system of the heart may serve to increase both permeability and passive transport capacity.

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