Pectoral Region Muscles

Clav head pec major origin

Medial half of clavicle

Sternocostal head pec major origin

Ant sternum, sup 6 costal cartilages, ext oblique aponeurosis

Pec major insertion

Lateral lip of ITS

Pec major innervation

Med/lat pectoral nerves

Pec major action

Adduct, med rotate humerus

Pec major clav head action

Flex humerus

Pec major sternocostal head action

Extend humerus from flexed position

Pec minor origin

Ribs 3-5

Pec minor insertion

Coracoid process of scap

Pec minor innervation

Medial pectoral nerve

Pec minor action

Stabilize scap by drawing anterior/inferior against thoracic wall

Subclavius origin

1st rib, near costal cartilage

Subclavius insertion

Inf surface of medial third of clav

Subclavius innervation

Subclavian nerve

Subclavius action

Anchors, depresses clav

Serratus anterior origin

Ext surfaces of ribs 1-8

Serratus anterior insertion

Medial border of scap, including angles

Serratus anterior innervation

Long thoracic nerve

Serratus anterior action

Protract/rot scap, holds against thoracic wall