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Tubercle of rib

Recommended video: Ribs [16:16]
Main features of the ribs.

The tubercle of the rib is a bony projection found in most ribs at the junction of the neck and body. It consists of a smooth articular part medially and a roughened non-articular part laterally. The articular part contains an oval facet for articulation with the transverse process of the associated vertebra, forming the costotransverse joints. The non-articular part serves as an attachment point for the lateral costotransverse ligament

The tubercle of the rib is more prominent on the upper ribs, with the articular surface being more convex in the superior six ribs and flatter on the 7th-10th ribs. It is not present in ribs eleven and twelve (floating ribs). 

Terminology English: Tubercle of rib
Latin: Tuberculum costae
Definition Small bony projection at the junction of the neck and body of ribs
Structure Contains a smooth articular part and a rough non-articular part
Function Articular part forms costotransverse joints with the transverse processes of corresponding vertebrae. Rough part serves as an attachment for the lateral costotransverse ligament. 

Learn more about the anatomy of ribs with this study unit (and article):

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