3)Blood-thymus barrier Components e Contineous endothelial cell e Complete basement membrane of endothelium e peri-vessel space containing macrophage ● basal lamina of epithelial reticular ce‖ ● Processes of epithelial reticular ce‖ Function: provide a stable environment for lymphocytes development3) Blood-thymus barrier: ---Components Contineous endothelial cell Complete basement membrane of endothelium peri-vessel space containing macrophage basal lamina of epithelial reticular cell Processes of epithelial reticular cell ---Function: provide a stable environment for lymphocytes development