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Costal margin

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Title: Costal margin  
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Subject: Costovertebral angle tenderness, Costal, Subcostal plane, Rectus sheath, Transverse plane
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Costal margin

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

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.

External links

  • 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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