Cross-Section Axon (IMAGE) Max-Planck-Gesellschaft Caption This is an electron microscope image of a cross-section through a mouse nerve: following injury, the myelin sheath of numerous regenerated nerve fibers is too thin. Credit MPI of Experimental Medicine Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.