Costal margin

Costal margin is the lower edge of the chest (thorax) formed by the bottom edge of the rib cage. It is an important anatomical landmark in the human body, particularly in medical examinations and surgery.

Anatomy

The costal margin is formed by the fusion of the costal cartilages of the seventh to tenth ribs. It is a prominent, curved edge that forms the lower part of the thoracic cage. The costal margin forms an arch across the front of the abdomen, with the apex at the xiphoid process, the smallest of the three parts of the sternum.

Clinical significance

The costal margin is an important landmark in physical examinations and surgical procedures. It is often used as a reference point for the examination of the liver and gallbladder, as these organs are located directly below the costal margin. In certain medical conditions, such as hepatomegaly (enlarged liver) or cholecystitis (inflammation of the gallbladder), the lower edge of these organs may extend below the costal margin.

See also

• Rib cage
• Costal cartilages
• Thoracic cage
• Hepatomegaly
• Cholecystitis

References

Costal margin Resources
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