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

Costal margin
Gray115.png
Anterior surface of sternum and costal cartilages. (The costal margin forms a large upside-down V on the inferior border.)
Details
Identifiers
Latinarcus costalis
TAA02.3.04.006
FMA7569
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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