Abstract
The formation of a blood-brain barrier to horseradish peroxidase was microscopically and ultrastructurally investigated in the tectum opticum of the chick during development of the intraneural blood vessel network from the 6th incubation day to hatching, and in adult specimens. Extravasation of the circulating marker, apparently unimpeded during early stages of vasculogenesis, starts to diminish from the 14th incubation day (i.d.) and is prevented after the 18th i.d. The tracer seems to get out of the vessel lumina through the sites of reciprocal contact between adjacent endothelial cells, and the differentiation of tight junctions there hinders the passage of peroxidase particles. The formation of numerous endothelial vacuoles during early vasculogenesis and the setting of the blood-brain barrier are discussed in connection with the mechanisms of transendothelial transport, and respectively, the processes of moulding of the growing endothelia.
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