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Inferior Border of Fifth Rib
Skeletal System

Inferior Border of Fifth Rib

Margo inferior costae quintae

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Description

The inferior border (lower border) of fifth rib is its sharp lower edge. It lies immediately inferior to the costal groove, which itself is located on the ribs inner surface. It is one of the two borders of the body of the fifth rib, the other being the superior border.

The inferior border of fifth rib provides origin sites for the external abdominal oblique muscle and the external, internal and innermost intercostal muscles.

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