Peripheral nerve

These cross sections of peripheral nerves contain unmyelinated axons.  Each nerve is surrounded by a distinct perineurium.  1000x, 3000x

These cross sections of peripheral nerves contain unmyelinated axons.  Each nerve is surrounded by a distinct perineurium.  1000x, 3000x

The perineurial cells form a compact wrapping around fascicles.  The cells of the perinerium are highly unique and contribute to the formation of the protective blood-nerve barrier.  They are distinct from fibroblasts which can be found within the fascicle where the secrete collagen fibrils.

The perineurial cells form a compact wrapping around fascicles.  The cells of the perinerium are highly unique and contribute to the formation of the protective blood-nerve barrier.  They are distinct from fibroblasts which can be found within the fascicle where the secrete collagen fibrils.