The manipulation mechanism of the giant panda (Ailuropida melanoleuca) was examined by means of CT
(computed tomography) and 3-dimensional (3-D) Volume Rendering techniques. In the 3-D images of the
giant panda hand, not only the bones but also the muscular system was visualised. Sections of the
articulated skeleton were obtained. It was demonstrated that the hand of the panda is equipped with
separately moulded manipulation units as follows: (1) the radial sesamoid (RS), the radial carpal, and the
first metacarpal (R–R–M) complex; and (2) the accessory carpal (AC) and the ulnar (A–U) complex. When
the giant panda grasps anything, the R–R–M complex strongly flexes at the wrist joint, the RS becomes
parallel with the AC, and the phalanges bend and hold the object. It is shown that the well-developed
opponens pollicis and abductor pollicis brevis muscles envelop and fix the objects between the R–R–M
complex and the phalanges during grasping.