What is the primary function of the posterior longitudinal ligament?

The primary function of the posterior longitudinal ligament is to stabilize the vertebral column. This ligament runs along the posterior aspect of the vertebral bodies in the spinal canal and plays a crucial role in maintaining alignment and stability of the spine. By connecting the adjacent vertebrae, it helps to prevent excessive movement that could lead to injury, such as hyperextension or flexion that could compromise the spinal cord or surrounding structures. While it also serves as a protective structure in the spinal canal, its main responsibility centers around the stabilization of the overall spinal framework.