The origin of the pectoralis major lower fibers is the anterior surface of the costal cartilages of the first six ribs, and adjoining portion of the sternum.

Question

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The pectoralis major muscle has a clavicular head and a sternocostal head, with the lower fibers originating from the anterior surface of the costal cartilages of the first six ribs and the adjoining portion of the sternum.

The Origin of the Pectoralis Major Lower Fibers Is the Anterior