Fig. 1.

Diagrammatic drawing of measurement of the location of the motor point of the brachialis muscle. The coracoid process and lateral epicondyle of the humerus were identified as reference points. The shortest distance between the reference points was measured and was defined as a reference line. The distance from the reference line to the motor point was recorded as an x value and the distance from the coracoid process to the point where the perpendicular line crossed the reference line was defined as a y value.