Abstract
Electron microscopic examination and classification of blood vessels in the marginal gingiva of cats and dogs showed that 97 per cent of the capillaries had a continuous endothelium while only 3 per cent were fenestrated. A continuous endothelial basal lamina was observed in about 90 per cent of these vessels but in 10 per cent it was either absent or partly replaced by a finely fibrillar material. Pericytes were present in 87 per cent of the capillaries classified. Ultrastructurally therefore the majority of gingival capillaries were of the types found in skin, fat and muscle and showed no structural features which could explain the plasma protein in gingival fluid.
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