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- There are 12 ribs and 11 intercostal spaces, which lie between the ribs ("costal" means rib).- Intercostal space numbering begins with the space between ribs 1 and 2.- The space inferior to rib 12 is called the "subcostal" space, since it is below ("sub") the rib.- The thoracic walls are primarily supplied by intercostal arteries, which travel within the intercostal spaces between the ribs.

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