Abstract

The increase in density and development of blood vessels (capillaries) were studied in the rat olfactory bulb. The density of blood vessels increased significantly over the second ten-day period of postnatal development. Electron microscopy revealed that blood vessels developed from solid cords of cells with thick endothelial cells, slit-like lumina and ill-defined lamina. The majority of these vessels became luminized during the second ten-day period and were characterized by patent lumina, well defined basal lamina and attenuated endothelial cells.

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