The artery of Adamkiewicz most commonly originates at the T9-T12 region.

a) The artery of Adamkiewicz originates in the cervical spine
b) The artery of Adamkiewicz originates at the T4 level
c) The artery of Adamkiewicz has a constant origin
d) The artery of Adamkiewicz most commonly originates at the T9-T12 region