Submitted for publication April 21, 1972.
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Diffusion processes into and out of optic nerve capillaries and between vitreous and optic nerves were studied with peroxidase in squirrel monkeys. Following intravenous injection of peroxidase, no passage of tracer out of optic nerve capillaries occurred. Diffusion was obstructed by zonulae occludentes of capillary endothelium. After intravitreal injection, tracer diffused freely through the internal limiting membrane into intercellular spaces of the optic nerve parenchyma. Zonula occludentes prevented flow from the perivascular spaces of the optic nerve into the capillary lumen. A blood-nerve diffusion barrier thus exists in the optic nerve.
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
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