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Questions and Answers
What is the distinguishing feature of the atypical ribs mentioned in the text?
What is the distinguishing feature of the atypical ribs mentioned in the text?
- The head of the rib has two facets (correct)
- The rib is bound by twine
- The second rib has a length equal to the first rib
- The surfaces of the rib go in between the typical vertebral surfaces
What is the relationship between the length of the first rib and the second rib, according to the text?
What is the relationship between the length of the first rib and the second rib, according to the text?
- The second rib is shorter than the first rib
- The second rib is the same length as the first rib (correct)
- The text does not provide information about the relative lengths of the first and second ribs
- The second rib is longer than the first rib
What is the significance of the surfaces of the atypical ribs going in between the typical vertebral surfaces?
What is the significance of the surfaces of the atypical ribs going in between the typical vertebral surfaces?
- It has no particular significance and is just a descriptive detail
- It suggests the ribs are fused to the vertebrae
- It means the ribs are providing additional support to the vertebral column
- It indicates the ribs are abnormally shaped (correct)
What is the purpose of the twine mentioned in the text?
What is the purpose of the twine mentioned in the text?
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Study Notes
Atypical Ribs
- 10th rib has a single articular facet on its head.
11th and 12th Ribs
- Ribs XI and XII articulate only with the bodies of their own vertebrae.
- These ribs have no tubercles or necks.
- They are short, have little curve, and are pointed anteriorly.
Atypical Thoracic Vertebrae
- The shaft of the vertebra extends backward and laterally to the tubercle at a site termed the angle.
- The inferior margin of the internal surface is marked by a distinct coastal groove.
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