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FIG 3. Electron micrographs of the unaffected median nerve after intravenous injection of horseradish peroxidase.
A, In the normal median nerve without compression, electron-attenuated of horseradish peroxidase was found in capillary lumen, but no leakage into the endoneurial space was observed.
B, There are a very small number of pinocytotic vesicles in the endothelium (arrowheads). The tight junction (arrow) among endothelial cells was closed, and the blood-nerve barrier was maintained (A, x5,000; B, x40,000). En, endoneurial space, E, endothelium; L, capillary lumen.
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