Figure 3
From: Anatomical study for elucidating the stabilization mechanism in the trapeziometacarpal joint
Macroscopic analysis of the dorsal aspect of the trapeziometacarpal joint. Photographs showing the layered relationships between the first dorsal interosseous (FDI) muscle and the joint capsule of the right thumb. (a) thumb and the second metacarpal bones (2nd MC) after removal of the skin and surrounding soft tissues. (b) the extensor pollicis brevis tendon (EPB), extensor pollicis longus tendon (EPL), extensor carpi radialis longus tendon (ECRL), 2nd MC, and abductor pollicis longus main tendon (APL-M) are removed from (a). (c): the muscular parts of the FDI are removed from (b), and the tendinous parts of the FDI and dorsal joint capsule (white arrowheads) are shown. APL-S, abductor pollicis longus–supernumerary tendon; FCR, flexor carpi radialis; Tm, trapezium; Dist, distal; Rad, radial; Palm, palmar.
