What should be considered when selecting electrode location?

• A. Tissue impedance
• B. Nerve or motor points
• C. Skin color
• D. Tissue impedance and nerve or motor points

Answer: (D)

When placing electrodes for electrical stimulation, you want the current to reach the target nerve or muscle efficiently while keeping the sensation comfortable. Skin and tissue properties create impedance that can resist current flow, so you look for locations with manageable impedance and you may prep the skin, use conductive gel, or choose electrode size to improve delivery. At the same time, motor points are the spots where the underlying nerve is most easily excited, so placing near a motor point helps evoke the desired muscle response with less current. By considering both impedance and proximity to a motor point, you maximize effectiveness and comfort. Skin color isn’t a reliable indicator for electrode placement and shouldn’t drive the choice.