Fig. 1

Peripheral nerve structure and vascular supply. A digital photomicrograph of a FITC-conjugated Ulex europaeus agglutinin-1 (green) stained frozen section of a human sciatic nerve counterstained with DAPI (blue) demonstrates the compartmentalized organization of peripheral nerves, with an epineurial macrovessel depicted in (a) and an endoneurial microvessel that forms the blood-nerve barrier depicted in (b). Endoneurial microvessels are capillary-like and are derived from epineurial macrovessels that penetrate the perineurium