doi: 10.1007/BF00231024.
Ultrastructure of capillaries in the conduction system of the heart in various mammals
- PMID: 688375
- DOI: 10.1007/BF00231024
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Ultrastructure of capillaries in the conduction system of the heart in various mammals
Cell Tissue Res.
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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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