How are thoracic vertebrae best described?

• A. Short spinous process and long transverse process
• B. Small and boxy
• C. Long spinous process and short transverse process (transverse process attaches to the ribs)
• D. Fused together

Answer: (C)

Thoracic vertebrae are best identified by their role in rib articulation. They have a long spinous process that angles downward, and the transverse processes feature facets that articulate with the ribs. This combination - a long spinous process and a transverse process that attaches to the ribs - is what set the thoracic region apart from other vertebral regions. The other patterns don’t fit: a short spinous process or a fused spine would not describe a normal thoracic vertebra, and descriptors emphasizing a small, boxy body don’t capture the rib-attaching features that define the thoracic vertebrae.