true rib
Definition
Noun: A true rib is one of the first seven pairs of ribs in a human being. These ribs are directly attached to the sternum (breastbone) by their own individual costal cartilages.
Usage
The term "true rib" is used specifically in human anatomy to classify ribs based on their attachment to the sternum. It is a technical term.
Examples
- In a typical human skeleton, there are 12 pairs of ribs, and the first seven pairs are true ribs.
- The true ribs (ribs 1-7) provide direct structural support to the front of the thoracic cage.
- A fracture of a true rib can be more painful because of its direct connection to the sternum.
Advanced Usage
- The classification system contrasts "true ribs" with "false ribs" (ribs 8-10, which attach indirectly to the sternum) and "floating ribs" (ribs 11-12, which have no sternal attachment).
Variants and Related Words
- Rib (noun): The general term for any of the curved bones forming the chest wall.
- False rib (noun): Any of the ribs (usually pairs 8, 9, and 10) that attach to the sternum indirectly via the costal cartilage of the rib above.
- Floating rib (noun): Either of the last two pairs of ribs (usually 11 and 12) that are not attached to the sternum at all.
- Costal cartilage (noun): The hyaline cartilage that connects a rib to the sternum (in true ribs) or to another rib (in false ribs).
Synonyms
- Vertebrosternal rib: A more precise anatomical synonym, indicating the rib connects to the vertebrae and the sternum.
Different Meanings
The word "true" in this compound term is used in a specific anatomical sense meaning "genuine" or "proper" in its connection. It does not imply the other ribs are "false" in a deceptive sense, but rather in a structural classification sense.
Noun
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one of the first seven ribs in a human being which attach to the sternum
