(A) Dissecting of renal resistance arteries. (B) Imaging renal vessels with two photon microscopy allows detecting three distinct tissue layers at different depths within the vessel wall: 1, fibroblasts rich in collagen; 2, smooth muscle cells (SMC) and 3, endothelial cells/elastic fibers. (C) Example of renal vessel imaging loaded with Fluo-4 AM Ca2+ indicator: Z-stack of the vessel, TL – vessel in transmitted light, 1, 2, and 3 corresponding layers are described in B.