Lymphatic capillary

Lymphatic capillaries are tiny, thin-walled microvessels located in the spaces between cells throughout most tissues of the body (except in the central nervous system and nonvascular tissues)[1][3][5]. Their primary function is to collect excess interstitial fluid—now called lymph once inside these vessels—and return it to the bloodstream, thereby maintaining tissue fluid balance and preventing edema[3][5][7]. Structurally, they consist of overlapping endothelial cells that form flap-like minivalves allowing one-way entry of fluid but preventing backflow[1][2][4]. Anchoring filaments connect these vessels to surrounding tissue; when tissue swells with excess fluid, these filaments pull open the minivalves further to facilitate increased uptake[1][2].\n\nLymphatic capillaries lack smooth muscle and have only a single layer of endothelium on a permeable basement membrane. They do not possess features typical of molecular drug targets such as receptors or enzymes. Instead, they serve as anatomical conduits for immune surveillance and waste removal by transporting lymph through progressively larger vessels toward lymph nodes and eventually back into venous circulation[1][3].\n\nBecause "lymphatic capillary" refers to an anatomical structure rather than a discrete molecule or protein complex (such as an enzyme or receptor), it is not considered a canonical therapeutic target. There are no known drugs that directly interact with or modulate individual lymphatic capillaries.\n\nNote: This entry is marked *is_incorrect = true* because "lymphatic capillary" is not a molecular entity nor recognized therapeutic target class like receptor, enzyme, transporter etc., but rather an anatomical vessel composed primarily of endothelial cells[1][2][4].

Other names

lymph capillaryinitial lymphaticprelymphatic