These processes project superiorly from the junction of the first segment's transverse process and pedicle. Like the similar processes in the lumbar vertebrae above them, their articular surfaces are directed dorsomedially. They form synovial articulations with the inferior articular processes of the fifth lumbar vertebra.

Articular arises from the Latin verb articulare meaning to join or connect. The term process is Latin meaning to move forward. It denotes a projection of bone.

Zygapophysis superior

Processus articularis superior vertebrae