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Questions and Answers
Which structure lies along the margins of the sternum and terminates as the superior epigastric and musculophrenic arteries?
How many pairs of intercostal spaces are there, each with 3 layers of muscles crucial to rib movement during respiration?
Which artery supplies 1st two spaces via the supreme intercostal artery?
What structure forms a collateral circulation in Coarctation of the Aorta?
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Where does the venous drainage of the intercostal space drain to anteriorly?
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Which artery supplies 2 per space in spaces 1 - 6?
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What is the arterial supply for spaces 7 – 10?
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Which artery supplies the 12th intercostal space?
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Where do the posterior intercostal arteries arise from?
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Which vein drains the 1st intercostal space posteriorly?
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Which structure separates the thorax from the abdomen?
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What is the main function of the intercostal muscles?
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Which structure articulates with the thoracic vertebrae?
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What is the main function of the thoracic inlet?
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Which structure forms the outlet of the thorax?
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What is the function of costal cartilages during respiration?
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Which structure protects the heart and pericardium?
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Which structure forms the upper opening of the thorax?
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What is the main function of the sternum in the thorax?
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Which structure assists in separating the thorax from the abdomen?
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Study Notes
Arterial Supply and Intercostal Spaces
- The internal thoracic artery lies along the margins of the sternum and terminates as the superior epigastric and musculophrenic arteries.
- There are 11 pairs of intercostal spaces, each with 3 layers of muscles crucial to rib movement during respiration.
- The supreme intercostal artery supplies the 1st two spaces.
- The posterior intercostal arteries supply 2 per space in spaces 1-6.
- The anterior intercostal arteries supply the 7th to 10th intercostal spaces.
- The subcostal artery supplies the 12th intercostal space.
Venous Drainage and Intercostal Spaces
- The venous drainage of the intercostal space drains to the internal thoracic vein anteriorly.
- The posterior intercostal veins drain the 1st intercostal space posteriorly.
Thoracic Structure and Function
- The diaphragm separates the thorax from the abdomen.
- The main function of the intercostal muscles is to facilitate rib movement during respiration.
- The ribs articulate with the thoracic vertebrae.
- The main function of the thoracic inlet is to allow for passage of structures between the neck and thorax.
- The thoracic outlet forms the lower opening of the thorax.
- The costal cartilages function to increase the elasticity of the thoracic cage during respiration.
- The sternum protects the heart and pericardium.
- The thoracic inlet forms the upper opening of the thorax.
- The main function of the sternum in the thorax is to provide a point of attachment for muscles and form the anterior thoracic wall.
- The diaphragm assists in separating the thorax from the abdomen.
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Description
Test your knowledge of thoracic anatomy by identifying and naming the features of a typical rib, a first rib, and the sternum, demonstrating how a rib articulates with the thoracic vertebrae, and identifying the different types of joints in the thorax. This quiz is based on selected sections from Moore Clinically Oriented Anatomy 8th Ed.
