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.
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Associated atlanto-axial subluxation, odontoid dysplasia and a short posterior arch of atlas can exacerbate the CV junction stenosis.

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