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Questions and Answers
How many pairs of ribs does an ox have?
How many pairs of ribs does an ox have?
- 13 pairs (correct)
- 12 pairs
- 14 pairs
- 10 pairs
What are ribs that do not attach to the sternum called?
What are ribs that do not attach to the sternum called?
- Sternal ribs
- Intercostal ribs
- Floating ribs
- Asternal ribs (correct)
Where does each rib articulate dorsally?
Where does each rib articulate dorsally?
- To vertebrae (correct)
- To the clavicle
- To the scapula
- To the sternum
What term is used for the space between the ribs?
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?
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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