<Tr> <Th> FMA </Th> <Td> 9139 72064, 9139 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of bone (edit on Wikidata) </Td> </Tr> <P> In vertebrates, thoracic vertebrae compose the middle segment of the vertebral column, between the cervical vertebrae and the lumbar vertebrae . In humans, there are twelve thoracic vertebrae and they are intermediate in size between the cervical and lumbar vertebrae; they increase in size going towards the lumbar vertebrae, with the lower ones being a lot larger than the upper . They are distinguished by the presence of facets on the sides of the bodies for articulation with the heads of the ribs, as well as facets on the transverse processes of all, except the eleventh and twelfth, for articulation with the tubercles of the ribs . By convention, the human thoracic vertebrae are numbered T1--T12, with the first one (T1) located closest to the skull and the others going down the spine toward the lumbar region . </P> <P> These are the general characteristics of the second through eighth thoracic vertebrae . The first and ninth through twelfth vertebrae contain certain peculiarities, and are detailed below . </P>

Where is t1 and t2 on the spine
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