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Anterior surface of sternum and costal cartilages. (The costal margin forms a large upside-down V on the inferior border.)
Sometimes referred to as the costal arch, the costal margin is the medial margin formed by the seventh to tenth ribs.
- Anatomy figure: 35:01-03 at Human Anatomy Online, SUNY Downstate Medical Center—"Bony landmarks of the abdomen"
- Atlas image: abdo_wall60 at the University of Michigan Health System
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