Fig. 10 in Anatomical Study of the Right Forearm and Hand of One Western Gorilla (Gorilla gorilla) for Comparison with Humans with Respect to Motions of the Thumb and Fingers

Fig. 10. The insertions of the first dorsal interosseous muscle. A. The distal portion of the 1st DI muscle is voluminously muscular and passes into the tendinous portion of the interosseous hood at the level of the proximal portion of the proximal phalanx; B. The tendinous insertion to the proximal phalanx base is exposed by reflect- ing the extensor apparatus. The tendon has been divided to explore the deeper structure and then re-sutured.