Bone
Atlas (C1)
First cervical vertebra
High-yield
No body and no spinous process; the 'yes' joint (atlanto-occipital). A Jefferson fracture bursts its ring.
Overview
The ring-shaped first cervical vertebra that supports the skull and allows the nodding 'yes' movement at the atlanto-occipital joint.
Reference facts
- Bone type
- Irregular (vertebra)
- Key landmarks
- Anterior and posterior arches; Lateral masses; Transverse processes with foramina; Facet for the dens
- Articulations
- Occipital condyles (atlanto-occipital joint); Axis (atlanto-axial joint)
Frequently asked questions
What type of bone is the atlas (C1)?
The atlas (C1) is an irregular (vertebra) bone.
What does the atlas (C1) articulate with?
The atlas (C1) articulates with the occipital condyles (atlanto-occipital joint); Axis (atlanto-axial joint).
What are the key landmarks of the atlas (C1)?
Key landmarks of the atlas (C1) include the anterior and posterior arches; Lateral masses; Transverse processes with foramina; Facet for the dens.