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O = manubrium & medial clavicle; I = mastoid process & superior nuchal line of occipital bone
O = sternal end of clavicle, sternum, cartilage of ribs 1-6 & aponeurosis of external oblique; I = sulcus & intertubucular groove
O = internal surface of rib cage & sternum, costal cartilages of last 6 ribs & lumbar vertebrae; I = central tendon
O = occipital bone, spine of C7 & all thoracic vertebrae; I = acromion, spine of scapula & lateral 1/3 of the clavicle
O = lower 6 thoracic vertebrae, lumbar vertebrae, lower 3 to 4 ribs & iliac crest; I = floor of intertubercular sulcus of humerus
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