Pectoralis Major, Minor, and Subclavius AOI
Pectoralis Major - Insertion
Crest of greater tubercle of humerus
Subclavius - Actions
Depress the clavicle and draw it anteriorly, elevate the first rib, and stabilize the sternoclavicular joint
Pectoralis Minor - Actions
Depress, abduct, and downwardly rotate the scapula
Subclavius - Origin
First rib and cartilage
Pectoralis Major - Actions (Upper fibers)
Flex and horizontally adduct the shoulder
Pectoralis Major - Actions (All fibers)
Adduct and medially rotate the shoulder, elevate the thorax during forced inhalation
Pectoralis Minor - Actions (with scapula fixed)
Assists to elevate the thorax during forced inhalation
Pectoralis Major - Actions (Lower fibers)
Extend the shoulder
Pectoralis Minor - Origin
Third, fourth, and fifth ribs
Subclavius - Insertion
Inferior surface of middle one-third of clavicle
Pectoralis Major - Origin
Medial half of clavicle, sternum, and cartilage of firsth through sixth ribs
Pectoralis Minor - Insertion
Medial surface of coracoid process of scapula