Pectoralis Minor

• Pectoralis Minor:

  • Thin, flat triangular muscle, lying deep to pectoralis major

  A) Pectoralis minor

  
• O (origin)

  • Outer borders of costal cartilage of ribs 3 - 5 and intervening intercostal fascia

  A) Pectoralis minor

  
• R (direction)

  • Superolateral from inferior attachments to the upper attachments

  A) Pectoralis minor

  
• I (insertions)

  • Upper surface and medial border of the coracoid process via a short, flat tendon

  A) Pectoralis minor

  
• A (actions)

  • Medial rotation and depression of scapula

  A) Pectoralis minor

  
• NS (nerve supply)

  • Medial pectoral nerve (C8, T1)

  A) Pectoralis minor

  
• Function:

  • Pulls scapula downwards and forwards during pushing and punching movements
  • Accessory muscle of inspiration

  A) Pectoralis minor