Typical feature of thoracic veebrae ?

Ans. is 'a' i.e., Hea shaped Thoracic veebrae There are 12 thoracic veebrae. T2-T9 are typical thoracic veebrae and Tl, TIO, Tl 1, T12 are atypical thoracic veebrae. Characteristic features of typical thoracic veebra : -Body is medium sized and hea shaped.Spinous process is long and inclined downward.Veebral foramen is small and circular.Transverse process possess costal facets for rib aiculation (last two veebrae lack these facets). Costal facets are also present on the sides of body for aiculation of heads of ribs.Superior aicular facet is directed backwards and laterally, and inferior aicular facet faces forward and medially. Aicular procesess are veically placed and interlocked; So dislocation can only occur if they are fractured.