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Pectoralis Major
Origin: Clavicular head: medial half of clavicle
Sternal head: sternum, cartilages of upper 6 ribs
Insertion: Lateral lip of bicipital groove of humerus
Action: Adduction, horizontal adduction and medial rotation of humerus
Clavicular head: flexion of humerus
Sternal head: extension of humerus from a flexed position
Nerve: Clavicular Head: lateral pectoral nerve (Cervical 5, 6, 7)
Sternal head: medial pectoral nerve (Cervical 8, Thoracic 1)
Palpate: Along anterior border of axilla during active adduction of humerus.
This muscle forms the anterior wall of the axilla.