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Elsevier
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Tubercle of Fourth Rib
Skeletal System

Tubercle of Fourth Rib

Tuberculum costae quartae

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Description

The tubercle of fourth rib is a small prominence on the external surface of the junction between its neck and its body. It consists of two parts:

—a smooth, medially located articular facet, which articulates with the transverse process of fourth thoracic vertebra;

—a rough, laterally located non-articular part, which provides the attachment site for the costotransverse ligament.

Overall, only the first to tenth ribs have a tubercle, while the eleventh and twelfth ribs lack this bony feature.

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