Fascicles in a peripheral nerve are organized within which protective layer that also contains vascular supply?

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Peripheral nerves are bundled with several protective layers, and the layer that wraps the entire nerve and contains the blood vessels (the vasa nervorum) is the epineurium. This outermost sheath not only protects the nerve but also provides the main vascular supply that nourishes all the fascicles inside. Within that outer coat, each fascicle is further wrapped by the perineurium, which acts as a protective barrier around the bundle. Inside a fascicle, individual axons are surrounded by the endoneurium, and the axons themselves have myelin sheaths. So the epineurium is the protective layer that houses the vascular supply to the nerve, including all the fascicles it contains.