Costal margin

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Costal margin
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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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