abstract:Of the three tubercles noticed in connection with the transverse processes of the lumbar vertebrae, the superior one is connected in the lumbar region with the back part of the superior articular process, and is named the mammillary process (processus mamillaris) or mammillary tubercle.
As aresult, insertion of a pediclescrewthrough the mammillaryprocess at one level cancauseinjury to the medialbranchof the dorsal rami that supplies the adjacentcephaladlevel.