Pectoralis Major (Origin, Insertion, Action, Innervation)

Which cervical nerves innervate the clavicular head of the pec major?

C5 and C6

Which cervical/thoracic nerves innervate the sternocostal head of the pec major?

C7, C8, T1

What is the action of the pec major?

adducts and medially rotates humerus; draws scapula anteriorly and inferiorly

The proximal attachment for the sternocostal head of the pectoralis major is where?

anterior sternum, superior 6 costal cartilages, and aponeurosis of external obliques

The proximal attachment for the clavicular head of the pectoralis major is where?

anterior surface of medial half of clavicle

The pectoralis major is divided into two heads, what are they?

clavicular head and sternocostal head

What is the distal attachment for the pectoralis major?

lateral lip of intertubercular sulcus of humerus

What is the innervation of the pectoralis major?

medial and lateral pectoral nerves