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M. pectoralis major
M. Pectoralis major is the principal humeral adductor, responsible for effecting the power stroke (lowering the wings and generating thrust) in birds. It is the largest muscle in the avian body. The pectorales arise primarily from the furcula, coracoclavicular membrane, and caudal and distal sternum and carina. The pectoralis is acutally a complex of three distinct muscles, M. Pectoralis superficialis, which serves as the prinicpal adductor of the humerus, and M. Pectoralis propatagialis longus and M. Pectoralis propatagialis brevis which tense the propatagium.