Fig. 2.

Radiographs of (A,B) Choloepus (UMUT unnumbered) and (C,D) Nycticebus (NSM M 35960) forelimbs in (A,C) flexed and (B,D) extended elbow joint angles. The cranial margin of the humerus is assumed to be nearly parallel to the shaft of the humerus (br-shft), and the line connecting the olecranon (Ol) and the wrist joint (W) is assumed to be nearly parallel to the shaft of the antebrachium (ab-shft). ab, antebrachium; hm, humerus; sc, scapula; S and W, shoulder and wrist joints, respectively.