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