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A rare anomaly of insertion of the extensor pollicis et indicis communis muscle


MOJ Anatomy & Physiology
José Aderval Aragão,1,3 Iapunira Catarina Sant’Anna Aragão,2 Felipe Matheus Sant’Anna Aragão,2 Marcos Torres Brito Filho,1 Natália Graciano Assis de Oliveira Andrade,2 Danilo Ribeiro Guerra,1 Francisco Prado Reis3

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Abstract

Bellies and muscular tendons anatomical variations are usually found in cadaver dissections and surgeries. Among those, it is worth highlighting the existence of the extensor pollicis et indicis communis muscle (EPIC), which has a global incidence from 0,5 to 4%. Report the finding of an extensor pollicis et indicis communis muscle found during a dissection of a cadaver on an anatomy laboratory. The extensor pollicis et indicis communis muscle was located on the posterior surface of the right forearm, between the extensor indicis and the extensor pollicis longus muscles. Its proximal insertion was on the distal third of the ulna, and the distal insertion on the proximal phalanx of the index finger and extensor pollicis longus tendon. The knowledge of the existence of the extensor pollicis et indicis communis muscle is of great importance not only for anatomists, but especially for hand surgeons, in the prevention of injuries during surgical procedures.

Keywords

anatomy, variation, tendons, extensor, fingers, anomalous insertion of [supplementary concept]; hand; reconstructive surgical procedures, interosseous membrane, indicis tendo, distal third

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