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Muscle Name: Pectoralis Major (Chest)

Medical Name:

• Pectoralis Major

Other Names:

• Pecs
• Chest Muscle

Head:

• Clavicular Head
• Sternal Head

Movement:

• Clavicular Head:
  • Flexion of the humerus (raising the arm forward)
• Sternal Head:
  • Adduction of the humerus (bringing the arm towards the body)
  • Medial rotation of the humerus (rotating the arm inward)
• Both Heads:
  • Horizontal adduction of the shoulder (moving the arm across the body)

Attachment:

• Origin:
  • Clavicular Head: Anterior surface of the medial half of the clavicle
  • Sternal Head: Anterior surface of the sternum, the superior six costal cartilages, and the aponeurosis of the external oblique muscle
• Insertion:
  • Lateral lip of the bicipital groove of the humerus (also known as the intertubercular sulcus)

Related Muscles:

• Pectoralis Minor
• Deltoids
• Serratus Anterior
• Latissimus Dorsi
• Subscapularis
• Coracobrachialis

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