What is the correct anterior to posterior order of ligaments in the mid to lower cervical spine?

• A. Posterior longitudinal ligament, intervertebral disc, anterior longitudinal ligament, spinal cord
• B. Intervertebral disc, anterior longitudinal ligament, spinal cord, ligamentum flavum
• C. Anterior longitudinal ligament, intervertebral disc, posterior longitudinal ligament, spinal cord
• D. Spinal cord, ligamentum flavum, anterior longitudinal ligament, posterior longitudinal ligament

Answer: (C)

In the mid to lower cervical spine, the correct anterior to posterior order of structures actually starts with the anterior longitudinal ligament, followed by the intervertebral disc, then the posterior longitudinal ligament, and finally the spinal cord.

The anterior longitudinal ligament is positioned most anteriorly, providing stability and limiting extension of the spine. Following this, the intervertebral disc acts as a shock absorber between vertebral bodies and serves as a barrier separating the anterior structures from those positioned more posteriorly. The posterior longitudinal ligament runs along the posterior aspect of the vertebral bodies and intervertebral discs, providing additional support and limiting flexion. Lastly, the spinal cord lies deep to all these structures in the spinal canal, being the most posterior in this arrangement.

This sequence reflects the anatomical organization of these structures, essential for understanding their relationship and roles in cervical spine mechanics.