Costal margin

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

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

Sometimes referred to as the costal arch, the costal margin is the medial margin formed by the seventh to tenth ribs.

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