Answer: Ribs attach posteriorly to the thoracic vertebrae. The tubercle of the ribs articulates with the costal facet.
Explanation: Ribs attach posteriorly to the thoracic vertebrae. The head of the rib articulates posteriorly with the costal facets which can be found on the bodies of thoracic vertebrae (The head of the rib is fitted into a small depressions found at the centrum of the adjacent vertebrae called demifacets). The rib tubercle also articulates with the facet situated at the vertebral transverse process. The most posterior area of the thoracic cage is formed by the angle of the ribs.
