The<unk>  is a specialised form of epithelium, distinct from but similar to vascular<unk> . A lymph capillary endothelial cell is distinct from other endothelial cells in that collagen fibers are directly attached to its plasma membrane. Although<unk> s were first described by Hippocrates in 400BC and rediscovered as "milky veins in the gut of a well fed dog" in the 17th century by Gasparo Aselli, they were ignored for centuries until in 1937 Howard Florey showed that<unk> s enlarge in inflammation. At this stage vascular and<unk>  endothelia were seen to be morphologically distinct and<unk>  vessels considered less important. Later it was discovered that VEGF-R3 and VEGF-C/VEGF-D were the key growth factors controlling<unk>  endothelial proliferation. Markers of<unk>  were not discovered until relatively recently. These being LYVE-1 (Jackson et al., 1999) and podoplanin (Kerjaschki, 1999).
Lymphatic endothelium
Athelia 
Bowman's capsule
Vasa vasorum
Reticuloendothelial system
Neointima
Preganglionic nerve fibers
Angiosome