Microscopic view of the glomeruli. Glomeruli are spherical "bags" of capillaries emanating from afferent arterioles and confined within the urinary space, which is continuous with the proximal tubule. The capillaries are partially attached to the mesangium, a continuation of the arteriolar wall consisting of
mesangial cells (A, arrow) and the matrix (B, arrow). The free wall of glomerular capillaries, across which filtration takes place, consists of a basement membrane (arrowheads) covered by visceral epithelial cells with individual foot processes (FP) and lined by endothelial cells.
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