odontoid process
Definition
Noun: A bony, tooth-like projection extending upward from the second cervical vertebra (the axis). This process serves as a pivot point, allowing the first vertebra (the atlas) and the skull to rotate.
Usage
The term "odontoid process" is used specifically in anatomical and medical contexts to describe this precise structure of the cervical spine. * The odontoid process is a critical structure for neck rotation. * A fracture of the odontoid process is a serious cervical spine injury. * The ligament holds the odontoid process against the front of the atlas.
Advanced Usage
- Clinical Significance: The odontoid process is a key landmark in medical imaging (e.g., X-rays, CT scans) of the cervical spine. Its integrity is assessed following trauma.
- Developmental Anatomy: Embryologically, the odontoid process is derived from the body of the first cervical vertebra (the atlas), which fuses to the axis.
Variants and Related Words
- Dens: This is the Latin synonym for "tooth" and is the alternative anatomical name for the odontoid process (e.g., "fracture of the dens").
- C2 vertebra / Axis: The vertebra from which the odontoid process projects.
- C1 vertebra / Atlas: The vertebra that rotates around the odontoid process.
Synonyms
- Dens (The preferred synonym in technical anatomical terminology)
Related Phrases
- Odontoid fracture: A specific type of break in the odontoid process.
- Odontoid peg: An informal descriptive term sometimes used due to its shape.
Noun
-
a toothlike process at the back of 2nd vertebra of the neck
