Costal margin

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Costal margin
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Anterior surface of sternum and costal cartilages. (The costal margin forms a large upside-down V on the inferior border.)
Latin arcus costalis

The costal margin is the lower edge of the chest (thorax) formed by the bottom edge of the rib cage.

Sometimes referred to as the costal arch, it is the medial margin formed by the false ribs and one true rib—specifically, from the seventh rib to the tenth rib.

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