Medullary venules are a continuation of high endothelial venules which condense repeatedly in the interfollicular cortex and peripheral deep cortical unit and then transition to medullary venules at the corticomedullary junction. The medullary venules condense and return centripetally to the hilar vein. [ http://www.ncbi.nlm.nih.gov/pubmed/17067937 http://orcid.org/0000-0003-3440-1876 ]