intraglomerular mesangium /mesangial cell small, irregular, with processes small dark n -EM: RER, Golgi, lysosome, phagocytic vesicles, cytoskeleton-MF, MT, IF and secretory granules -functions: i. produce ground substance ii. phagocytosis iii, contract iv secrete renin and enzymes /matrix. -type lv collagen glycoprotein: sulphate chondritin, heparin and dermatan*intraglomerular mesangium: /mesangial cell: -small, irregular, with processes -small dark N -EM: RER, Golgi, lysosome, phagocytic vesicles, cytoskeleton-MF, MT,IF and secretory granules -functions: i. produce ground substance ii. phagocytosis iii. contract iv. secrete renin and enzymes /matrix: -type IV collagen -glycoprotein: sulphate chondritin, heparin and dermatan