high endothelial postcapillary venule


Any of a group of venules located in the lymph nodes, tonsils, and aggregated lymphatic follicles, having a high-walled endothelium through which blood lymphocytes migrate into the lymphatic parenchyma.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.