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(A) Digital photograph and (B) schematic illustration of a fully instrumented frog plantaris longus (PL) muscle prior to closing the incision, which shows an E-shaped tendon force transducer on the PL tendon, a pair of sonomicrometry crystals at the proximal and distal ends of a central fascicle, and two EMG electrodes embedded in the mid-belly of PL. (C) Schematic illustration of the sonomicrometry placement in PL relative to fascicle orientation.
