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The pectoralis major has a broad origin, based on which it is divided into three parts Clavicular part, sternocostal part and abdominal part All three parts converge laterally and insert onto the greater tubercle of humerus The main function of this chest muscle as a whole is the adduction and internal rotation of the arm in the shoulder joint. It makes up the bulk of the chest muscles and lies under the breast Beneath the pectoralis major is the pectoralis minor muscle
