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Pectoralis Major (Clavicular)

Pectoralis Major

Description

Origin :

  • and aponeurosis of external oblique muscle
  • superior six costal cartilages
  • Clavicular head: anterior surface of medial half of clavicle

Insertion :

  • Lateral lip of intertubercular groove of humerus

Innervation :

  • clavicular head (C5 and C6)
  • Lateral and medial pectoral nerves;

Depth :

  • Superficial

Action

Action :

  • Adducts and medially rotates humerus;
  • draws scapula anteriorly and inferiorly
  • Acting alone: clavicular head flexes humerus
Target Muscles Target MusclesAdducts and medially rotates humerus. Draws scapula anteriorly and inferiorly. Acting alone: clavicular head flexes humerus