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The vascularization of the cochlea is essential for a better understanding of diseases of the hearing organ. Therefore it is of great interest, to find a method for the visualization of the cochlea which is located with the hardest mammalian bone (Petrous). Synchrotron radiation-based micro computed tomography (SRmicroCT) allows a non-destructive characterization of the cochlear blood vessels with true micrometer resolution down to the capillaries. The vascular structure of murine cochlea differs from the human ones, but its size and relative simplicity shorten the measurement and analysis. The murine inner ear was extracted out of the Petrous bone, stained with osmium, and embedded in PMMA. The SRmicroCT measurements were carried out at the beamline BW2 (HASYLAB at DESY, Hamburg, Germany) and the beamline 4S (PSI, Villigen, Switzerland) using photon energies of 10.8 and 10.9 keV to quantify the osmium distribution by differential absorption contrast. The osmium stained blood vessels exhibit strong local X-ray absorption, which allows the intensity-based segmentation using the tomograms. The 3D dataset of the vascular tree in the cochlea permits flow simulations, which should allow characterizing the blood supply with unattained precision. Thus, diseases can be analyzed and the efficacy of promising therapies can be predicted. Furthermore, the tomograms enable to build detailed 3D models for teaching purposes. Taken together SRmicroCT is a versatile technique to non-destructively uncover the morphology of tissue down to about 1 micron avoiding any kind of preparation artifacts as the result of cutting procedures.