Posterior Longitudinal Ligament: The vertebral canal is the primary location of the posterior longitudinal ligament and the latter may extend up to the posterior aspect of the vertebrae and as well as the body of the axis. This also becomes continuous with the membrana tectoria running down the sacrum.

The posterior longitudinal ligament also appears to be thicker around the thoracic region than it used to be in the cervical and lumbar areas. Aside from that, it is also somewhat broader in the upper aspect. The anatomical structure of the posterior longitudinal would help specialists understand pathologic conditions involving the vertebral column especially that of spinal disc herniation. Dense, compact, smooth and shining longitudinal fibers make up the posterior longitudinal ligament which is contrary to the anterior ligament.