College of Massage Therapists of British Columbia (CMTBC) Practice Exam

Which landmarks are unique to the lumbar vertebrae?

1. mammillary processes

2. transverse foramen

3. lamina

4. transverse costal facet

The correct answer is: mammillary processes

The mammillary processes are indeed unique to the lumbar vertebrae and play an important role in the anatomy of the lumbar spine. These small, rounded projections are located on the posterior aspect of the superior articular processes of each lumbar vertebra. They provide attachment points for the multifidus muscles and are involved in the segmental stability of the lumbar spine. In contrast, the transverse foramen is a distinct feature found in the cervical vertebrae, specifically allowing passage for the vertebral arteries and veins. The lamina, while present in all vertebrae, does not serve as a landmark specific to the lumbar region; it forms part of the vertebral arch in every vertebra. Additionally, the transverse costal facet is found in the thoracic vertebrae where it articulates with the ribs, making it non-unique to the lumbar region. Thus, identifying mammillary processes as unique to lumbar vertebrae emphasizes the distinct anatomy that characterizes this section of the spine and its importance for spinal stability and function.