This slide shows a single nerve composed of two bundles of nerve fibers called fascicles.  Each fascicle is surrounded by a thin layer of connective tissue called the perineurium.  A much thicker, tough fibrous sheath, the epineurium, encloses the entire nerve. 

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The address of A/P Lab is:  http://bioweb.uwlax.edu/aplab/      Direct comments or questions to gillis.rick@uwlax.edu