Capillary cross section, illustration 插畫檔

Illustration of the cross-sectional structures of three major types of capillaries. The upper panel depicts continuous capillaries characterised by uninterrupted endothelial cells and an intact basement membrane, which are commonly found in muscle and nervous tissues. The middle panel shows fenestrated capillaries containing endothelial fenestrations that enhance permeability, predominantly located in the kidneys and endocrine glands. The lower panel presents sinusoidal capillaries featuring large lumens and discontinuous basement membranes that permit the passage of macromolecules, primarily observed in the liver and spleen