Pronator Quadratus

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Original Author(s): Oliver Jones
Last updated: October 5, 2022
Revisions: 2

Original Author(s): Oliver Jones
Last updated: October 5, 2022
Revisions: 2

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The pronator quadratus is a muscle within the deep compartment of the anterior forearm. It is a square-shaped muscle which lies deep to the tendons of flexor pollicis longus and flexor digitorum profundus.

  • Attachments: Originates from the anterior surface of the ulna and attaches to the anterior surface of the radius.
  • Actions: Pronates the forearm.
  • Innervation: Median nerve (anterior interosseous branch).
  • Blood supply: Ulnar artery

Fig 1 – Deep flexor muscles of the anterior forearm.