Definition

Noun: - The first cervical vertebra: The topmost vertebra of the spinal column, which supports the skull and allows for the nodding motion of the head. It is named after Atlas, the Titan from Greek mythology who held up the celestial spheres.

Usage

• The term "atlas vertebra" is used in anatomical, medical, and biological contexts to specify the first cervical vertebra (C1). It is a precise, technical term.
• It is typically used with the definite article "the" when referring to it in a specific context (e.g., ), but can be used with indefinite articles when speaking generally (e.g., ).

Examples

• Noun:
  • The atlas vertebra articulates with the occipital condyles of the skull.
  • A fracture of the atlas vertebra is a serious spinal injury.
  • In humans, the atlas is a ring-like bone that lacks a vertebral body.

Advanced Usage

• "The atlas": In medical and anatomical parlance, it is very common to refer to this bone simply as "the atlas". The word "vertebra" is often implied and omitted.
  • The patient has a congenital anomaly of the atlas.

Variants and Related Words

• Atlas (noun): The common abbreviated form for the atlas vertebra.
• C1 (noun): The standard anatomical and medical abbreviation (C = cervical).
• Axis vertebra (noun): The second cervical vertebra (C2), which articulates with the atlas and allows for rotational movement of the head.

Synonyms

• C1 vertebra: The formal anatomical synonym.
• First cervical vertebra: The descriptive synonym.

Notes on Meaning

The term refers exclusively to a specific anatomical structure. Unlike the common noun "atlas" (meaning a book of maps), "atlas vertebra" has no idiomatic or figurative meanings. Its name is purely an allusion to the mythological figure's role of supporting a great weight.

Noun

1. the 1st cervical vertebra