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Left first rib

Costa prima sinistra · Levé první žebro

Skeleton

Looks like

The shortest, flattest and most curved rib, lying under the collarbone at the top of the chest.

What it does

Forms the rim of the upper chest opening; the main artery, vein and nerves to the arm cross over it.

Keeping it well

It breaks only with major force, which warns of injury to the vessels near it. Pressure on nerves or vessels here causes thoracic outlet syndrome.

Related conditions