Blood supply
The blood supply to a peripheral nerve is from two sources:
- extrinsic supply:
- derived from vessels running in the fascia, perforating through muscle or from the periosteum of bones
- joins the nerve via a mesoneurium
- arborizes on the epineurial surface of the nerve
- intrinsic supply:
- an intraneural microvascular plexus that is located in all layers of the nerve but particularly along the internal epineurium and within the endoneurium
- anastomoses with the extrinsic supply
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