| Costal margin | |
|---|---|
| Anterior surface of sternum and costa cartilages. (Costal margin forms a large upside-down V on the inferior border) | |
| Latin | arcus costalis |
The costal margin, sometimes referred to as the costal arch, is the medial margin formed by the false ribs and one true rib -- specifically, from the seventh rib to the tenth rib.
Costal margin: The lower edge of the chest (thorax) formed by the bottom edge of the rib cage.
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