Rib 3

The rib 3 (third rib) is a true rib rib that articulates posteriorly with the third thoracic vertebra at the costovertebral and costotransverse joints.

Anteriorly, it connects to the sternum via its costal cartilage. The third rib, like other true ribs (ribs 1-7), has a head, neck, tubercle, and body. The head of the rib has two articular facets that articulate with the bodies of the second and third thoracic vertebrae. The neck is a flattened portion that extends laterally from the head. The tubercle, located at the junction of the neck and body, articulates with the transverse process of the third thoracic vertebra. The body of the rib is curved and flattened, with a costal groove on its inferior border that houses the intercostal vessels and nerve.