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Questions and Answers
Which structure forms the lower boundary of the thorax on each side?
Which structure forms the lower boundary of the thorax on each side?
- Sternum
- Costal margin (correct)
- Diaphragm
- Suprapleural membranes
Where is the subcostal angle situated?
Where is the subcostal angle situated?
- Between the sternal attachments of the 2nd and 3rd costal cartilage
- At the superior end of the sternum
- Between the sternal attachments of the 7th and 8th costal cartilage (correct)
- At the inferior end of the sternum
What forms the floor of the thorax?
What forms the floor of the thorax?
- Costal margin
- Suprapleural membranes
- Sternum
- Diaphragm (correct)
What forms the roof of the thorax?
What forms the roof of the thorax?
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Where is the first prominent thoracic spine felt?
Where is the first prominent thoracic spine felt?
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Where do the anterior intercostal arteries originate from?
Where do the anterior intercostal arteries originate from?
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How many anterior intercostal arteries are there on each side of the body?
How many anterior intercostal arteries are there on each side of the body?
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What do the anterior intercostal arteries supply?
What do the anterior intercostal arteries supply?
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Which artery is responsible for supplying the upper five or six anterior intercostal arteries?
Which artery is responsible for supplying the upper five or six anterior intercostal arteries?
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Study Notes
Boundaries of the Thorax
- The lower boundary of the thorax on each side is formed by the costal margin.
Thoracic Angle
- The subcostal angle is situated at the junction of the 7th and 8th ribs.
Floor and Roof of the Thorax
- The floor of the thorax is formed by the diaphragm.
- The roof of the thorax is formed by the thoracic inlet.
Thoracic Spine
- The first prominent thoracic spine is felt at the 7th cervical vertebra.
Anterior Intercostal Arteries
- The anterior intercostal arteries originate from the internal thoracic artery.
- There are 9 anterior intercostal arteries on each side of the body.
- The anterior intercostal arteries supply the anterior thoracic wall.
- The internal thoracic artery is responsible for supplying the upper five or six anterior intercostal arteries.
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