PERIPHERAL NERVOUS SYSTEM
NERVES – 3
Part of a cross-section of a large nerve formed by four fascicles. Next to it, indicated by the arrow, a small isolated nerve.
The epineurium (highlighted in blue) surrounds the whole large nerve. Its connective tissue extends into the nerve interior surrounding its various fascicles (highlighted in red).
A perineurium (highlighted in dark green) surrounds each fascicle. Very small nerves as the one indicated by the arrow are covered by a perineuron.
The nerve fibers of large nerves are often organized in separate bundles. The spaces between the bundles of each bundle are artificial and result from the tissue preparation technique.
