Thoracic Vertebrae

First, ninth, tenth, eleventh, and twelfth thoracic vertebrae from the left side. 1, Inferior articular process with out-turned facet. 2, Single facet for head of XII. rib; no facet on transverse process. 3, Single facet for head of XI. rib; no facet on transverse process. 4, Single or demifacet for head of X. rib. 5, Occasional demifacet for head of X. rib. 6. Demifacet for head of IX. rib. 7, Demifacet for head of II. rib. 8, Single facet o head of II. rib. 9, Facet on transverse process for tuberosity of I. rib. 10, Facet on transverse process for tuberosity of IX. rib. Labels: S, superior tubercles corresponding to mammillary; I, inferior tubercles corresponding to accessory; e, external tubercles corresponding to transverse of lumbar.

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