postcapillary venules

post·cap·il·lar·y ven·ules

the microvasculature immediately following the capillaries, ranging in size from 10-50 mcm, and characterized by investment of pericytes; they are the site of extravasation of blood cells, are particularly sensitive to histamine, and are believed to be important in blood-interstitial fluid exchanges.
Synonym(s): pericytic venules

post·cap·il·lar·y ve·nules

(pōst-kap'i-lar-ē ven'yūls)
The microvasculature immediately following the capillaries, ranging in size from 10-50 mcm, and characterized by investment of pericytes; they are the site of extravasation of blood cells, are particularly sensitive to histamine, and are believed to be important in blood-interstitial fluid exchanges.
Synonym(s): pericytic venules.
References in periodicals archive ?
All types of the disease share the same clinical presentation due to unregulated generation of bradykinin causing leakage of plasma from postcapillary venules (5-7).
These telangiectasias, the hallmark of the disease, arise from the dilatation of postcapillary venules, which directly fuse with an arteriole, thus bypassing the capillary system.
The excessive accumulation of neutrophils in the postcapillary venules during inflammation causes clogging of the vessels; therefore, there is a decrease in tissue perfusion (3).
Also, it is well accepted that Th2-derived interleukin-5 (IL-5) plays a key role in developing and maturing of eosinophils, enhancing their adhesion to endothelial cells lining the postcapillary venules, activating, secreting, and prolonging survival through apoptosis inhibition in the tissues [16].
Senile hemangioma or CA is a vascular tumor which consists of proliferated small vascular channels which have been originated from postcapillary venules in the upper dermis and it has been mentioned that CA should not be considered as a neovascularization [5].
HSP, also known as anaphylactoid purpura and immunoglobulin A (IgA) vasculitis, is a small-vessel leukocytoclastic vasculitis characterized by the perivascular deposition of IgAl-based immune complexes in the walls of arterioles and postcapillary venules. (1) The clinical picture of HSP is palpable purpura, abdominal pain, arthritis, and hematuria 1-2 weeks following an upper respiratory infection.
Under physiological conditions, naive (i.e., mature, non-activated) lymphocytes migrate from the peripheral blood into lymph nodes and Peyer's patches by selectively interacting with the specialized endothelium of postcapillary venules called high endothelial venules (HEVs).
Circulating naive T cells migrate to the parenchyma of draining lymph nodes through specialized postcapillary venules called high endothelial venules (HEVs) (Figure 1).
Three to five postcapillary venules per mouse were recorded (4-6 mice per group) (1 min 20 seconds each venule) and cell adhesion quantified from one minute of the recording.
Pericytes embedded within the basement membrane of capillaries and postcapillary venules play an important role in endothelial cell proliferation, migration, and stabilization [34].
Thus the T-cells and the blood vessels, mainly postcapillary venules, may be induced to proliferate.