Spine · Irregular bone
Atlas (C1 Vertebra)
The atlas is the top vertebra of the spine, which the skull sits on. It is named after the mythological Atlas who held up the sky, and it allows you to nod "yes".
What it is
The atlas (C1) is a ring-shaped bone at the very top of the spine, uniquely without a body, that supports the skull.
Where it is
The top of the neck, directly beneath the skull.
What it does
Supports and balances the skull and, with the joint above it, allows the nodding "yes" movement of the head.
Connections
Joints and connections
- Joint with the skull (occipital bone)
- Joint with the axis (C2) below
When things go wrong
Common injuries and conditions
- Atlas fracture (e.g. a "Jefferson fracture" from an axial load) — a serious neck injury
Education and reference only. This explains the anatomy in plain terms; it is not a diagnosis. A severe injury, a visibly deformed limb, or the inability to move or bear weight needs urgent assessment — call 999 or go to A&E for a serious injury.
Did you know?
An interesting fact
The atlas is named after the Greek Titan Atlas, who was said to hold up the heavens — just as this bone holds up the head.
Answers
Atlas: frequently asked questions
What is the atlas bone?
The atlas is the first (top) vertebra of the spine, on which the skull rests. It allows the head to nod.
Explore the spine
Related bones
Sources
Where this is drawn from
- NHS — Anatomy and body systems
- Gray's Anatomy for Students (Drake, Vogl, Mitchell)
- TeachMeAnatomy — skeletal system
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