The axis vertebra of a mammal differs from th | vedclass

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(D) The $atlas$ is the first cervical vertebra $(C1)$,which is ring-like and lacks a $centrum$ and a $neural$ $spine$.The $axis$ is the second cervica

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Presence of odontoid process

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(D) The $atlas$ is the first cervical vertebra $(C1)$,which is ring-like and lacks a $centrum$ and a $neural$ $spine$.The $axis$ is the second cervical vertebra $(C2)$,which is characterized by a prominent peg-like projection called the $odontoid$ $process$ (or $dens$) that projects cranially from its $centrum$.This $odontoid$ $process$ acts as a pivot around which the $atlas$ (and the skull) rotates,allowing for the side-to-side movement of the head.Therefore,the $axis$ differs from the $atlas$ primarily due to the presence of the $odontoid$ $process$.

The axis vertebra of a mammal differs from the atlas in:

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