Pronator Quadratus

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The Pronator Quadratus is a deep muscle of the anterior forearm.

Anatomical Attachments:

• Origin: Attaches to the distal 1/4 of the anterior ulnar.
• Insertion: Attaches to the distal 1/4 of the anterior radius.

Action: It pronates the forearm and hand.

Synergist: Pronator Teres.

Antagonist: Supinator.

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Nerve Supply: Median nerve (C6, C7).

Vascular supply: Volar interosseus of the ulnar artery.

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