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Pronator quadratus




General Information

  • This section is strictly limited to anatomy, you might be looking for clinical relevant information which is found under the clinical chapters -- muscles section, click here to go to that page


  • Deep


  • Anterior ulna
    • Distal 1/4


  • Anterior radius
    • Distal 1/4

Main function

  • RU joint
    • Pronation

Nerve innervation

  • Segmental
    • C7-Th1
  • Peripheral
    • Median nerve

Arterial supply

  • Anterior interosseus artery


  • Patient position
    • Sitting or supine
  • Place your hand distally and laterally on the anterior side of the lower arm
  • Localize the radial pulse
  • Give resistance towards supination so that the patient is giving force towards pronation
  • You can feel on both sides of the radial artery for contraction of the pronator quadratus

Strength test for pronator teres and pronator quadratus

  • Patient position
    • Sitting or supine
  • Stabilize the patient's elbow to avoid abduction movement of the shoulder
  • Ask the patient to hold the arm in pronation and partly flexion of the elbow
  • Give resistance to the lower part of the forearm just proximal to the wrist in a supinated direction so that the patient is giving force towards pronation
  • The patient maintains the position of the arm while giving resistance during the length of the test