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origin - clavicle, sternum of 7th rib, cartilage true ribs, aponeurosis external obliqueinsertion - humerusinnervation - lateral and medial pectoral nerveblood supply - pectoral branch thoracic-acromial artery, perforating branches internal thoracic arteryaction - flexes and adducts arm, rotates arm medially (FAM)

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1.
origin - clavicle, sternum of 7th rib, cartilage true ribs, aponeurosis external oblique

insertion - humerus

innervation - lateral and medial pectoral nerve

blood supply - pectoral branch thoracic-acromial artery, perforating branches internal thoracic artery

action - flexes and adducts arm, rotates arm medially (FAM)





 
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