The barrier between the perineurium of PERIPHERAL NERVES and the endothelium (ENDOTHELIUM, VASCULAR) of endoneurial CAPILLARIES. The perineurium acts as a diffusion barrier, but ion permeability at the blood-nerve barrier is still higher than at the BLOOD-BRAIN BARRIER.

Synonyms: Barriers, Blood-Nerve, Barrier, Blood-Nerve, Blood-Nerve Barrier, Blood-Nerve Barriers, Blood Nerve Barrier