The vertebrae of birds are characteristically

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(A) The vertebrae of birds are characteristically $Heterocoelous$. In a $Heterocoelous$ vertebra,the centrum has a saddle-shaped articular surface,whe

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Heterocoelous

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(A) The vertebrae of birds are characteristically $Heterocoelous$. In a $Heterocoelous$ vertebra,the centrum has a saddle-shaped articular surface,where one face is convex in one direction and concave in the other,allowing for significant flexibility of the neck while preventing rotation. This structure is a unique adaptation in birds that provides stability and mobility to the cervical region.

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