axis vertebra
Noun: - The second cervical vertebra: A specific bone in the neck (cervical spine) that allows the head to rotate from side to side. It is characterized by a prominent, tooth-like projection called the odontoid process (or dens) around which the first vertebra (the atlas) pivots.
The term "axis vertebra" is a precise anatomical term. It is used in medical, biological, and scientific contexts to refer specifically to this bone. - In human anatomy, the axis vertebra (C2) articulates with the atlas vertebra (C1) to enable the rotational movement of the head. - A fracture of the axis vertebra can be a serious spinal injury. - The distinctive feature of the axis is its odontoid process.
- "The axis": In specialized anatomical discourse, the word "axis" alone is often used to mean the axis vertebra.
- The dens is a part of the axis.
- Axis (noun): The common abbreviated form used in medical terminology.
- C2 (noun): The alphanumeric designation for the second cervical vertebra.
- Epistropheus (noun): An older, less common synonym for the axis vertebra.
- Odontoid process / Dens (noun): The critical projecting part of the axis vertebra that acts as the pivot point.
- Cervical vertebra C2
- Epistropheus (technical, historical)
The term "axis vertebra" refers exclusively to a single, specific anatomical structure. It does not have other general meanings. The word "axis" by itself can have other definitions (e.g., a central line, an alliance), but when combined with "vertebra," its meaning is fixed in anatomy.
- the 2nd cervical vertebra; serves as a pivot for turning the head