Muscles of the Pectoral Region

Pectoralis major attachment

Clavicular head: medial half of clavicle

Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle

Pectoralis major distal attachment

Lateral lip of intertubercular sulcus of humerus

Pectoralis major innervation

Lateral and medial pectoral nerves

Pectoralis major action

Adducts and medially rotates humerus; Acting alone, clavicular head flexes humerus and sternocostal head extends it from the flexed position

Pectoralis minor attachment

3rd-5th ribs

Pectoralis minor distal attachment

coracoid process of scapula

Pectoralis minor innervation

medial pectoral nerve

Pectoralis minor action

Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall

Subclavius proximal attachment

1st rib near costal cartilage

Subclavius distal attachment

Inferior surface of middle third of clavicleSu

Subclavius innervation

nerve to subclavius

Subclavius action

anchors and depresses clavicle

Serratus anterior attachment

external surfaces of 1st-8ths ribs

Serratus anterior attachment

medial border of scapula, including superior and inferior angles

Serratus anterior innveration

long thoracic nerve

Serratus anterior action

Protracts scapula and holds it against thoracic wall; rotates scapula