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Emg Wiring Diagram 81 85
Emg Wiring Diagram 81 85
, concentric bipolar (B), monopolar (C), single fiber needles (D and E), and Macro EMG (F). Dimensions vary, but the diameters of the outside cannulas shown resemble 26-gauge hypodermic needles (460 μm) for A, D, and E; a 23-gauge needle (640 μm) for B; and a 28-gauge needle (360 μm) for C and F. The exposed-tip areas measure 150 × 300 μm, with spacing between wires of 200 μm center to center for B; 0.14 sq mm for C; and 25 μm in diameter for D, E, and F. A flat-skin electrode completes the circuit with unipolar electrodes shown in C and D. For Macro EMG (F), a 10-mm side port is located behind the tip, exposing a 25-g diameter platinum wire. Macro EMG recording is made on one channel from the side port electrode with the cannula as reference (ordinary single-fiber EMG recording), and other channel potentials are recorded between the cannula and a remote subcutaneous concentric needle electrode as reference, placed at least 30 cm away. Contribution from all muscle fibers in a motor unit is extracted using spike-triggered averaging from the two channels..jpg)
