Pectoralis major (lateral part)
Innervation:
Lateral pectoral nerve
Roots:
C5
C6
C7
C8
T1
Function:
Adducts and medially rotates the humerus.
Draws the scapula anteriorly and inferiorly.
Flexes the humerus (clavicular head).
Adducts the humerus (sternocostal head).