A vertebra with a transverse costal facet is most characteristically from which region?

• A. Cervical
• B. Lumbar
• C. Thoracic
• D. Sacral

Answer: (C)

Transverse costal facets are the rib-articulating surfaces on the transverse processes where the tubercle of a rib sits. This feature is specific to thoracic vertebrae, reflecting how the ribs attach to the spine. Cervical vertebrae have transverse foramina and do not bear these rib facets; lumbar vertebrae lack costal facets entirely and are built for weight-bearing; the sacrum consists of fused vertebrae with different articulations. So, finding a vertebra with a transverse costal facet points to the thoracic region.