Pectoralis Major- Attachments
Origin (proximal attachment) Sternocostal head • Has manubrial, sternal, and aponeurotic fibers • Manubrial fibers – from lateral half of anterior surface of manubrium • Sternal fibers –from lateral half of anterior surface of sternum up to 6th costal cartilage • Costal fibers – from 2nd to 6th costal cartilages. • Aponeurotic fibers – from aponeurosis of external oblique muscle of abdomen