part_of part of part of vessel lymphatic vessel http://upload.wikimedia.org/wikipedia/commons/4/44/Illu_lymph_capillary.jpg lymph vessel MAT:0000443 vas lymphaticum MESH:D042601 Tetrapods have evolved distinct lymphatic systems, in which lymphatic capillaries help drain most of the tissues of the body.[well established][VHOG] A vessel that contains or conveys lymph.[AAO] CALOHA:TS-2102 AAO:0011005 SCTID:279089004 A vessel that contains or conveys lymph, that originates as an interfibrillar or intercellular cleft or space in a tissue or organ, and that if small has no distinct walls or walls composed only of endothelial cells and if large resembles a vein in structure[BTO]. EFO:0000873 XAO:0000375 EMAPA:35532 UBERON:0001473 Wikipedia:Lymphatic_vessel BTO:0000752 NCIT:C33038 A network of blunt ended vessels lacking direct connection to the blood vascular system. These vessels collect and drain fluids and macromolecules from interstitial spaces throughout the animal. They derive from a subpopulation of endothelial cells and have walls that are much thinner than the blood carrying vessels. Lymphatic vessels are usually classified as either superficial or deep.[TAO] UMLS:C0229889 FMA:30315 MA:0000138 VHOG:0001249 blood vessel lymphatic part of lymphoid system