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Pectoralis Major Origin: • medial 1/3 of clavicle • anterior aspect of manubrium & length of body of sternum • cartilaginous attachments of upper 6 ribs • external oblique's aponeurosis Insertion: • lateral lip of bicipital groove to the crest of the greater tubercle • Clavicular fibers insert more distally; sternal fibers more proximally Action: • adducts humerus • medially rotates humerus • flexion of the arm from extension (clavicular portion) Blood: • pectoralis branch of thoracoacromial artery (runs with lateral pec. nerve) • lateral thoracic artery (lesser supply, and runs with medial pectoral nerve) Nerve: • lateral pectoral nerve, C5,6,7 to clavicular portion • medial pectoral nerve, C8,T1 to sternal portion Pectoralis Major QuickTime™ and a decompressor are needed to see this picture. Pectoralis Major Pectoralis Minor Origin: • outer surface of ribs 2-5 or 3-5 or 6 Insertion: • medial aspect of coracoid process of the scapula Action: • depresses & downwardly rotates the scapula • assists in scapular protraction from a retracted position • stabilizes the scapula Blood: • lateral thoracic artery Nerve: • medial pectoral nerve, C8,T1 Pectoralis Minor QuickTime™ and a decompressor are needed to see this picture. Pectoralis Minor Coracobrachialis Origin: • coracoid process of the scapula Insertion: • medial shaft of the humerus at about its middle Action: • flexes the humerus • assists to adduct the humerus Blood: • muscular branches of the brachial artery Nerve: • musculocutaneous nerve, C5,6,(C7) Coracobrachialis QuickTime™ and a decompressor are needed to see this picture. Coracobrachialis Biceps Brachii Origin: • long head- supraglenoid tubercle and glenohumeral labrum • short head- tip of the coracoid process of the scapula Insertion: • radial tuberosity • bicipital aponeurosis Action: • flexes the forearm at the elbow (when supinated) • supinates forearm from neutral • stabilizes anterior aspect of shoulder • flexes shoulder (weak if at all) Blood: • muscular branches of brachial artery Nerve: • musculocutaneous nerve, C5,6 Biceps Brachii QuickTime™ and a decompressor are needed to see this picture. Biceps Brachii Brachialis Origin: • lower 1/2 of anterior humerus • both intermuscular septa Insertion: • ulnar tuberosity • coronoid process of ulna slightly Action: • elbow flexion (major mover) Blood: • muscular branches of brachial artery • radial recurrent artery Nerve: • musculocutaneous nerve, C5,6 Brachialis QuickTime™ and a decompressor are needed to see this picture.
