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Pronator quadratus is a square shaped muscle on the distal forearm that acts to pronate (turn so the palm faces downwards) the hand. As it is on the anterior side of the arm, it is innervated by a branch of the median nerve, the anterior interosseous nerve (roots C8 and T1 with T1 being primary).
The aconeus is situated medially and superiorly in the extensor compartment of the forearm. It is blended with the fibres of the triceps brachii, and the two muscles can be indistinguishable. 1  Attachments: Originates from the lateral epicondyle, and attaches to the posterior and lateral part of the olecrannon.2  Actions: Moves the ulna during pronation and extends at the elbow joint. 3  Innervation: Radial nerve.he aconeus is situated medially and superiorly in the extensor compartment of the forearm. It is blended with the fibres of the triceps brachii, and the two muscles can be indistinguishable. 1  Attachments: Originates from the lateral epicondyle, and attaches to the posterior and lateral part of the olecrannon.