Functional anatomy of the radial sesamoid bone in the giant panda (Ailuropoda melanoleuca).
AUTOR(ES)
Endo, H
RESUMO
The function of the radial sesamoid bone (RS) in the giant panda (Ailuropoda melanoleuca) was examined by macroscopic study of RS-related bones and muscles. The RS was observed to be connected to the scapholunar and the 1st metacarpal bones. A joint cavity was present between the proximal surface of the RS and the distal area of the scapholunar bone but the RS possessed a fibrous joint connecting it to the proximal radial surface of the 1st metacarpal bone. It is suggested that the RS possesses no substantial abductor-adductor function as the articulation between the RS and the 1st metacarpal bone (FM) seems not to permit flexible movement of the RS. The RS may be a supporting process opposite the digits in the palm when the animal flexes its 5 digits to grip objects, but it is not an active grasping apparatus. In the muscular system, abductor pollicis longus provided strong tendons to the RS as an RS-abductor, whereas the abductor pollicis brevis, opponens pollicis and aponeurosis palmaris were well developed as an RS-adductor muscle group. Observation of RS articulations, however, showed that the muscles do not provide appreciable abduction-adduction actions for the RS.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1167701Documentos Relacionados
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