Abstract: Objective To investigate the relationship between the pedicle and the transverse process in the thoracic and lumbar verte-brae. Methods 111antertior-posterior images of the lumbar vertebra and 111antertior-posterior images of the thoracic vertebra were chosen and lines were drawn between two pedicle centers of the same segment. The transverse process was divided into 4 equal parts by horizontal lines. The corresponding study was performed on the relationship between the pedicle and the transverse pro cess. Results Most of the T₁～T₂ pedicles corresponded to the midline of the transverse process. A large number of the T₃～T₁₁ pedicles corresponded to the upper 1/3 of the transverse process and the others corresponded to the upper margin, upper 1/4 or the midline of the transverse process. Most of the T₁₂ pedicles corresponded to the upper margin of the transverse process. A large number of the L₁, L₂ and L₅ pedicles corresponded to the upper 1/3 of the transverse process. A large number of the L₃ and L_{4 pedicles corresponded to the midline of the transverse process. Conclusion The thoracic and lumbar pedicles have a multiform corresponding relationship with the transverse process.}

Key words: thoracic vertebra, lumbar vertebra, transverse process, pedicle, corresponding relationship