the movement of blood corpuscles through a blood vessel wall
The process in which leukocytes pass out of the blood and into inflamed tissues by squeezing between cells of capillary walls.
Passage of blood cells through intact vessel walls.
Diapedesis is the movement of leukocytes across the endothelial lining of blood vessels to interstitial fluid (IF). The process is driven by chemotactic factors which serve to upregulate expression of adhesion molecules on the endothelial cells of postcapillary venules adjacent to the site of infection. Neutrophils, Monocytes and NK cells use "roll to stop" kinetics in order to slow down and "ooze through" (diapedesis) interendothelial spaces between endothelial cells and infiltrate the infected tissue.