Figure 1.

Left distal forelimb of a turkey, Meleagris gallopavo (IVPP 1222): (a) wrist in minimum abduction; (b) wrist in maximum abduction; and (c) radiale. All views are dorsal. sc, articular surface for carpometacarpus; sr, articular surface for radius; su, articular surface for ulna. Angle of abduction shown in (a,b), radiale angle between ulnar surface and dorsal part of carpometacarpal surface shown in (c). Note that measuring with respect to the palmar part of carpometacarpal surface would result in even larger radiale angle.