Peripheral Nerve Bundle

This slide allows you to visualize the different layers of connective tissue that comprise a nerve bundle. At the smallest level are the individual myelin sheaths covering the axons. Each of these nerve fibers is then ensheathed in a layer of endoneurium. Several fibers are surrounded and bound together by perineurium, which appears much thicker. Finally, an outer sheath of epineurium surrounds the entire trunk. You will see that muscle has a similar organization during the next laboratory.