图示正常肾小球。注意血管袢和系膜的关系。15％的肾小球滤过通过系膜，其它的通过有孔的血管内皮细胞滤过。正常的阴离子屏障阻止象白蛋白这样的蛋白分子从内膜通过。正常系膜含2～4个具有巨噬细胞的功能的系膜细胞。
A normal glomerulus is shown diagramatically. Note the relationship of the capillary loops to the mesangium. About 15% of glomerular filtration occurs through the mesangium, with the remainder through the fenestrated epithelium. The normal anionic charge barrier prevents protein molecules such as albumin from passing through the endothelium. The normal mesangium contains about 2 to 4 mesangial cells, which have a macrophage-like function.
