Axis (C2)

Axis

The axis is characterized by the dens (odontoid process), a tooth-like projection that extends superiorly from the body to articulate with the anterior arch of the atlas. This unique arrangement allows approximately 50% of cervical rotation.

Type Bone
Body System Skeletal
Body Region Spine
Latin Name Axis
FMA ID 12520

Function

The second cervical vertebra that provides a pivot point for rotation of the head. The dens (odontoid process) projects superiorly and acts as the axis around which the atlas rotates.

Clinical Significance

Odontoid fractures are common cervical spine injuries, especially in elderly patients. Hangman's fracture involves bilateral pars interarticularis fractures of C2. Atlantoaxial instability occurs in rheumatoid arthritis and Down syndrome.

Frequently Asked Questions

What is the Axis (C2)?
The axis is characterized by the dens (odontoid process), a tooth-like projection that extends superiorly from the body to articulate with the anterior arch of the atlas. This unique arrangement allows approximately 50% of cervical rotation.
What is the function of the Axis (C2)?
The second cervical vertebra that provides a pivot point for rotation of the head. The dens (odontoid process) projects superiorly and acts as the axis around which the atlas rotates.
What body system is the Axis (C2) part of?
The Axis (C2) is part of the Skeletal.
What conditions affect the Axis (C2)?
Odontoid fractures are common cervical spine injuries, especially in elderly patients. Hangman's fracture involves bilateral pars interarticularis fractures of C2. Atlantoaxial instability occurs in rheumatoid arthritis and Down syndrome.
Where is the Axis (C2) located?
The Axis (C2) is located in the Spine region of the body.

Related Structures

articular surface articular system joint system articulation joint Atlas (C1) Atlas attachment site axial skeleton plus cranial skeleton skeleton axiale bone collagen fibril bone condensation

Medical Disclaimer

This content is for educational and informational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.