Pectoralis Major

Origin: Sternal half of the Clavicle, sternum to 7th rib, cartilages of true ribs, aponeurosis of external oblique

Insertion: Lateral lip of bicipital groove of the Humerus

Function: Adducts arm, extends arm, internal rotation of the shoulder along with other

Muscles which produce shoulder Adduction

Muscles which produce shoulder Extension

Muscles which produce shoulder Internal (medial) Rotation

Nerve: dual innervation by the Medial Pectoral Nerve and the Lateral Pectoral Nerve

Artery: Pectoral branch of Thoracoacromial artery and the Internal Mammary artery

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Links to this page: Alphabetical Muscle Index | Brachial Plexus Lateral Cord | Brachial Plexus Lower Trunk Anterior Division | Brachial Plexus Lower Trunk | Brachial Plexus Medial Cord | Brachial Plexus Upper Trunk Anterior Division | Brachial Plexus Upper Trunk | C5 Root Shared Muscle Innervation | C5, C6 roots | C5, C6, C7, C8, T1 roots | C6 Root shared muscle Innervation | C7 Root Shared Muscle Innervation | C8 Root Shared Muscle Innervation | C8, T1 roots | Clavicle | Internal Mammary artery | Lateral pectoral nerve route to pectoralis major | Lateral Pectoral Nerve | Medial pectoral nerve route to pectoralis major | Medial Pectoral Nerve | Muscles connecting arm to thorax | Muscles which Depress the scapula | Muscles which produce Downward Rotation of the scapula | Muscles which produce scapular abduction (protraction) | Muscles which produce shoulder Adduction | Muscles which produce shoulder Extension | Muscles which produce shoulder Internal (medial) Rotation | Nerve route to Pectoralis Major | Pectoral branch of Thoracoacromial artery | Pectoralis Major Tendons | Proximal Humerus | T1 Root shared muscle Innervation |