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Ultrasound image of the perineural and subparaneural spaces. Shown are the paraneural sheath surrounding the sciatic nerve and the perineural space between the epimysium of the adjacent muscles and the paraneural sheath. The subparaneural space is located inside the paraneural sheath (dotted line). CPN = common peroneal nerve, PN = perineural space, SP = subparaneural space, TN = tibial nerve.
