posterior arch of atlas

pos·te·ri·or arch of at·las

[TA] the posterior arch of the atlas that connects the lateral masses of the atlas posteriorly and bears the posterior tubercle; it forms the posterior wall of the vertebral canal at this level. Synonym(s): arcus posterior atlantis [TA]

pos·te·ri·or arch of at·las

(pos-tēr'ē-ŏr ahrch at'lăs) [TA] The bony arch that connects the lateral masses of the atlas posteriorly, forming the posterior wall of the vertebral canal at this level.