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Intramuscular nerve pattern in the FPL (right, superficial side). A: Drawing demonstrating the FPL is supplied by the AIONB. B: The red dashed line represents the percentage of the dense zone of intramuscular nerves of the FPL relative to the forearm length; the dots represent the percentage of the nerve entry point of the FPL relative to the forearm length (AIONB, anterior interosseous nerve branches; MN, median nerve).
