5)renal interstitial CT fibers: type l,Ill, IV collagen matrix cell fibroblast macrophage lipid-laden interstitial cell stellate cell with processes osmiophilic lipid droplets function i. involve in formation of f and matrix ii.secret prostaglandin5) renal interstitial: CT ---fibers: type I,III,IV collagen ---matrix ---cell: fibroblast macrophage lipid-laden interstitial cell: -stellate cell with processes -osmiophilic lipid droplets: -function: i. involve in formation of F and matrix ii. secret prostaglandin