Pectoral Region

• Subclavius
  • Bony Attachments:
    • 1: 1st rib and it's cartilage.
    • 2: Inferior surface of the clavicle
  • Innervation: Nerve to subclavius (C5)
  • Arterial Supply: Clavicular br. of the thoracoacromial trunk
  • Action: Draws the clavicle (and hence the shoulder) down and forward
• Pectoralis Major
  • Bony Attachments:
    • 1: Medial clavicle, manubrium & body of sternum, costal cartilages of ribs 2-6, sometimes from the rectus sheath of the upper abdominal wall.
    • 2: Greater tubercle of the humerus.
  • Innervation: Medial and lateral pectoral nerves (C5-T1).
  • Arterial Supply: Pectoral branch of the thoracoacromial trunk
  • Action: Flexes and adducts the arm, medially rotates the arm.
• Pectoralis Minor
  • Bony Attachments:
    • 1: Ribs 3-5.
    • 2: Coracoid process of the scapula.
  • Innervation: Medial pectoral nerve (C8, T1).
  • Arterial Supply: Pectoral branch of the thoracoacromial trunk.
  • Action: Pulls coracoid forward, medial, and downward.