There are a total of 12 thoracic vertebra.  All of them articulate with rib.  Their characteristics include:

• The body is usually taller than they are wide.
• The body has four demifacets on each side known as Superior and Inferior costal facets for articulating with the head of rib, except for T1, T10-T12.
• Spinous process is long and point inferiorly.
• Vertebral foramen is circular.
• Transverse process contain a Transverse costal facet for ariculating with the tubercle of rib, except for T11-T12.
• Articular facets face posteriorly and anteriorly.