Photomicrograph of the deep cortex of a lymph node. This photomicrograph shows several longitudinally sectioned high endothelial venules (HEVs) as well as several that are seen in cross section (arrows). These vessels are lined by cuboidal endothelial cells. In some preparations, the walls of a HEV may be infiltrated with migrating lymphocytes, making it difficult to recognize. X400. Inset. The cross section of a HEV shown here at higher magnification reveals several lymphocytes (arrowheads) in the process of migrating from the HEV into the parenchyma of the lymph node. X640
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