Motor Point
The skin surface location where electrical stimulation most effectively activates a muscle with minimal current. Anatomical landmark used in electrodiagnostic testing and therapeutic stimulation.
Full Definition
A motor point is the specific location on the skin surface where a muscle can be most easily activated with electrical stimulation using the least amount of current. It typically corresponds to the point where the motor nerve enters the muscle belly or where the nerve branches are most superficial. Motor points are used as standard electrode placement sites during nerve conduction studies, repetitive stimulation testing, and therapeutic electrical stimulation. Knowledge of motor point anatomy is essential for consistent and reliable electrodiagnostic testing. Motor points may shift in location due to anatomical variations, previous surgery, or muscle atrophy, requiring careful palpation and adjustment during testing.
Usage
Usage note: Write as two words 'motor point' not 'motorpoint' or 'motor-point'.
In Context
- "The recording electrode was placed over the motor point of the abductor digiti minimi." — Nerve conduction study protocol
- "Difficulty locating the motor point suggested muscle atrophy or anatomical variation." — Electrodiagnostic procedure note