American Society of Radiologic Technologist (ASRT) Practice Exam

Which part of the thoracic vertebrae articulates with the heads of the ribs?

1. Bodies

2. Laminae

3. Pedicles

4. Transverse processes

The correct answer is: Bodies

The bodies of the thoracic vertebrae are the components that articulate with the heads of the ribs. Each thoracic vertebra has two facets on the sides of its body that meet with the rib heads, allowing for the attachment of the ribs to the spine. This articulation is critical for the structural integrity and movement of the thoracic cage, as it enables the ribs to pivot around the vertebral column during respiration. While the laminae, pedicles, and transverse processes are notable features of thoracic vertebrae, they serve different functions. The laminae form the posterior part of the vertebral arch, the pedicles connect the body of the vertebra to the vertebral arch, and the transverse processes serve as attachment points for muscles and ligaments, as well as areas for the articulation of the tubercles of the ribs. However, they do not specifically interact with the rib heads in the same way that the bodies do. Thus, the bodies of the thoracic vertebrae play a vital role in facilitating rib connections and are essential for understanding thoracic anatomy.