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The deep extensors include: supinator brevis, extensor ossis metacarpi pollicis, extensor primi internodii pollicis, extensor secundi internodii pollicis, and extensor indicis, 1899. From 'The Treatise of the Human Anatomy and Its Applications to the Practice of Medicine and Surgery, Volume I' (1899). The posterior interosseous artery is the branch of the common interosseous which passes backward between the bones of the forearm and the upper border of the interosseous membrane and oblique ligament. The posterior interosseous nerve winds around the outer side of the upper end of the radius, through the substance of the supinator brevis muscle, to the back of the forearm, whene it passes downward, in company with the posterior interosseous artery, between the superficial and deep extensor muscles, to the upper border of the extensor secundi internodii pollicis. (Photo by VintageMedStock/Getty Images)