Fig. 9. Underdeveloped EIP. A 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. 9. Underdeveloped EIP. A small slender muscle sitting at the dorsoradial aspect of the ulna is judged to be underdeveloped EIP muscle although its tendon attaches to the dorsal aspect of the wrist (a white block arrow).