<P> The atlas 's chief peculiarity is that it has no body . It is ring - like and consists of an anterior and a posterior arch and two lateral masses . </P>
<P> The atlas 's chief peculiarity is that it has no body . It is ring - like and consists of an anterior and a posterior arch and two lateral masses . </P>
what is the most posterior structure of the atlas c1 vertebra
what is the most posterior structure of the atlas c1 vertebra
posterior arch
posterior arch