Abstract
When following published standards for recording from the upper fibres of trapezius, surface electrodes are placed on a line halfway between the spinous process of the seventh cervical vertebrae and the angle of the acromion. The purpose of this study was to determine exactly how such surface electrode placement might relate to morphology of the fibres of upper trapezius. Consideration of the fasicular anatomy of trapezius relative to standard surface electrode placement revealed that such placement would record from the middle not the upper fibres. These results have important implications for those studies evaluating electrical activity in trapezius as they have recorded from the middle fibres yet interpreted their results in terms of the classically defined functions of the upper fibres of the trapezius muscle.
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