10 Questions
Which structure forms the lower boundary of the thorax on each side?
Costal margin
Where is the subcostal angle situated?
Between the sternal attachments of the 7th and 8th costal cartilage
What forms the floor of the thorax?
Diaphragm
What forms the roof of the thorax?
Suprapleural membranes
Where is the first prominent thoracic spine felt?
At the lower end of nuchal furrow
Where do the anterior intercostal arteries originate from?
Internal thoracic artery
How many anterior intercostal arteries are there on each side of the body?
9
What do the anterior intercostal arteries supply?
Intercostal muscles and pectoral muscles
Which artery is responsible for supplying the upper five or six anterior intercostal arteries?
Internal thoracic artery
1
Supreme intercostal artery and thoracic aorta
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.
Test your knowledge on the anatomy and function of the thoracic wall and the mechanism of respiration with this quiz. Explore the surface landmarks of the thorax and understand the importance of thoracic viscera in health and disease.
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