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A peripheral nerve is composed of bundles (fasciculi) of nerve
fibers. A nerve fiber consists of an axon together with its
myelin
sheath or coverings. Under high magnification the axon appears as a
dark spot surrounded by a lighter circular area, the myelin sheath.
There are also groups of smaller, poorly-myelinated axons between
the large, well-myelinated axons. |
See
this slide with the virtual
microscope