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Clavicle, sternum, and upper six costal cartilages
Pectoralis major origin

Lateral lip of bicipital groove of humerus
Pectoralis major insertion

Medial and lateral pectoral nerves from brachial plexus
Pectoralis major nerve

Adducts arm and rotates it medially; clavicular fibers also flex arm
Pectoralis major action

Third, fourth, and fifth ribs
Pectoralis minor origin

Coracoid process of scapula
Pectoralis minor insertion

Medial pectoral nerve from brachial plexus
Pectoralis minor nerve

Depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin
Pectoralis minor action

First costal cartilage
Subclavius origin

Clavicle
Subclavius insertion

Nerve to subclavius from upper trunk of brachial plexus
Subclavius nerve

Depresses the clavicle and steadies this bone during movements of the shoulder girdle
Subclavius action

Upper eight ribs
Serratus anterior origin

Medial border and inferior angle of scapula
Serratus anterior insertion

Long thoracic nerve
Serratus anterior nerve

Draws the scapula forward around the thoracic wall; rotates scapula
Serratus anterior action
