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. 2019 Dec 19;55(1):27–32. doi: 10.1055/s-0039-1700821

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Fig. 3 — (A) - (a) Posterior interosseous nerve (PIN); (b) branches to supinator muscle (S) proximal to the Frohse arcade (FA); (c) fibrous FA; (d) fibrous distal margin of S. (B)- (a) fibrous margin of the extensor carpi radialis brevis muscle (ECRB); (b) PIN; (c) branch to S.