Pronator Quadratus

• O (origin):

  • Lower 1/4 anterior surface of ulna

  A) Pronator quadratus

  
• R (direction):

  • Transversely

  A) Pronator quadratus

  
• I (insertions):

  • Lower 1/4 anterior surface of radius
  • Some deeper fibres insert into triangular area above ulnar notch of radius

  A) Pronator quadratus

  
• A (actions):

  • Initiates forearm pronation
  • Stabilises inferior radio-ulnar joint

  A) Pronator quadratus

  
• NS (nerve supply):

  • Median nerve (C5 - T1)

  A) Pronator quadratus