An Anatomical Study of the Pseudothumb and Skeleton on the Red Panda(<i>Ailurus fulgens</i>)

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  • レッサーパンダ(<i>Ailurus fulgens</i>)の疑似母指と主要骨格の解剖

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"The panda's thumb"is very famous change and there are many reports in giant pandas. This pseudothumb bone is known technically as the radial sesamoid. This same bone is also said to be enlarged but not to such a great extent in the red panda. But there is little report in a small relative animal. We studied the main skeleton and radial sesamoid bones with its connected muscles on two red pandas. The vertebral formula of these red pandas is 7 cervical vertebrae, 14 thoracic vertebrae, 6 lumbar vertebrae, 3 sacrum vertebrae and 17 caudal vertebrae. There are 36 or 38 permanent teeth in these adult red pandas:incisor 3/3, canine 1/1, premolar 3/(3-4), and molar 2/2. The palmar of red pandas is made of 7 carpal bones, and one or two radial sesamoid bones are present. The length of radial sesamoid is half the length of the first metacarpal bone. Three muscles and four ligaments are connected with the radial sesamoid in the red panda. It seems that the radial sesamoid of the red panda may be used like a thumb, but there is obviously less power involved than with the giant panda.

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