Surface Mapping of Motor Points in Biceps Brachii Muscle
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초록
Objective To localize the site of motor points within human biceps brachii muscles through surface mapping using electrophysiological method. Method We recorded the compound muscle action potentials of each lattice of the biceps brachii in 40 healthy subjects. Standardized reference lines were made as the following: 1) a horizontal reference line (elbow crease)and 2) a vertical reference line connecting coracoid process and mid-point of the horizontal reference line. Th e Compound muscle action potentials were mapped in reference to the standardized reference lines. Th e locations of motor points were mapped to the skin surface, in the ratio to the length of the vertical and the half of the horizontal reference lines. Results The motor point of the short head of biceps was located at 69.0±4.9% distal and 19.1±9.5% medial to the mid-point of horizontal reference line. The location of the motor point of the long head of the biceps was 67.3±4.3% distal and 21.4±8.7% lateral. Th e motor point of the short head of the biceps was located more medially and distally in the male subjects compared to that in the female (p<0.05). Conclusion Th is study showed electrophysiological motor points of the biceps brachii muscles through surface mapping. Th is data might improve the clinical effi cacy and the feasibility of motor point targeting, when injecting botulinum neurotoxin in biceps brachii.
Abstract
Objective To localize the site of motor points within human biceps brachii muscles through surface mapping using electrophysiological method. Method We recorded the compound muscle action potentials of each lattice of the biceps brachii in 40 healthy subjects. Standardized reference lines were made as the following: 1) a horizontal reference line (elbow crease)and 2) a vertical reference line connecting coracoid process and mid-point of the horizontal reference line. Th e Compound muscle action potentials were mapped in reference to the standardized reference lines. Th e locations of motor points were mapped to the skin surface, in the ratio to the length of the vertical and the half of the horizontal reference lines. Results The motor point of the short head of biceps was located at 69.0±4.9% distal and 19.1±9.5% medial to the mid-point of horizontal reference line. The location of the motor point of the long head of the biceps was 67.3±4.3% distal and 21.4±8.7% lateral. Th e motor point of the short head of the biceps was located more medially and distally in the male subjects compared to that in the female (p<0.05). Conclusion Th is study showed electrophysiological motor points of the biceps brachii muscles through surface mapping. Th is data might improve the clinical effi cacy and the feasibility of motor point targeting, when injecting botulinum neurotoxin in biceps brachii.
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