Contribution of pectoralis major partitions in humeral movement

Anatomical evidence points to the existence of 6-8 architecturally distinct partitions within the pectoralis major (PM), suggesting differential contributions of these partitions to humeral movement. This study investigated the activation of PM partitions using high-density electromyography in three humeral positions in males. Increased activation of the middle and inferior partitions occurred across all positions examined, creating key basic and clinical science implications.