What unique landmark is found only on the lumbar vertebrae?

The mammillary processes are unique features found only on the lumbar vertebrae. These small, rounded projections are located on the posterior aspect of the superior articular processes of the lumbar vertebrae. They serve as attachments for muscles and ligaments and play a role in the movement and stabilization of the lumbar spine. Unlike the mammillary processes, other options such as the transverse foramen are found in cervical vertebrae, while the lamina and transverse costal facet appear in thoracic vertebrae as well as other regions. The presence of mammillary processes is a distinguishing characteristic of the lumbar vertebrae, highlighting their specific anatomical adaptations for load-bearing and flexibility in the lower back region.