Questions and Answers
How many pairs of ribs does an ox have?
13 pairs
What are ribs that do not attach to the sternum called?
Asternal ribs
Where does each rib articulate dorsally?
To vertebrae
What term is used for the space between the ribs?
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What is a notable feature of the lower part of a rib's shaft?
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Study Notes
Ribs Structure and Characteristics
- Ribs are elongated, curved bones forming the lateral thoracic wall skeleton.
- Each rib is a flat, curved plate with two extremities.
Ribs Classification
- There are 13 pairs of ribs, divided into two categories: sternal ribs (7 pairs) and asternal ribs (5 pairs).
- Sternal ribs articulate to the sternum via their cartilage.
- Asternal ribs, also known as false ribs, do not articulate to the sternum.
Ribs Connection and Movement
- Ribs articulate dorsally to vertebrae via costal cartilage.
- The last ribs in the series, called floating ribs, have free, vented ends that are not attached to adjacent cartilages.
Intercostal Space
- The space between ribs is called the intercostal space.
Ribs Shape and Orientation
- The shaft of a rib is more curved at the upper part and twisted, inclined inward at the lower part.
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