チーター（Acinonyx jubatus）における半規管の配置と直交性について

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  • Orientation and Orthogonality of the Semicircular Canals in the Cheetah (Acinonyx jubatus)
  • チーター(Acinonyx jubatus)ニ オケル ハンキカン ノ ハイチ ト チョッコウセイ ニ ツイテ

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The purpose of this study was to clarify the spatial orientation of the semicircular canals in the cheetah (Acinonyx jubatus) using computed tomography (CT). CT scan was performed on the skull of a cheetah. Scanning data were reconstructed into the cross-sectional images, and then the landmark coordinates were determined to define the planes of the semicircular canals and the cross-sections of the skull. In the cheetah, the lateral semicircular canal was parallel to the base of the skull. The angles between the anterior and posterior semicircular canals was lager than 90 degrees, and each canal showed the similar angle with the sagittal cross-section of the skull, although these planar directions were different. One limitation of this study is that here we provided only one specimen, and thus the present results need to be confirmed by examining a larger number of cases in future studies. However, the method outlined in this study provided quantitative descriptions of orientations and orthogonalities of the semicircular canals of the cheetah. This is potentially useful for indentifying the morphological features of the semicircular canals in felids.

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