Aryal Vinayak, Black Asa C., Jimenez Andreea
Tver State Medical University
University of South Carolina Greenville School of Medicine
The posterior longitudinal ligament is one of the three more important ligaments that contribute to stability in the spine. This ligament passes along the posterior aspect of the vertebral body inside the vertebral canal from the body of the axis to the sacrum. The ligament is composed of longitudinal fibers that are denser than the anterior longitudinal ligament. However, like the anterior longitudinal ligament, the denser fibers are deeper and span one vertebra, while the superficial fibers span three to four. The superficial layer is a continuation of the tectorial membrane at the axis, and the deep layer is a continuation of the cruciform ligament at the atlas. The fibers are wider at the intervertebral spaces and are more adherent to the annulus fibrosus of the intervertebral discs than at the vertebral body, where they are thinner. This phenomenon is more visible in the posterior ligament than in the anterior. Therefore, the posterior longitudinal ligament is much thinner than the anterior longitudinal ligament, which is significant for the pathophysiology of disc herniations occurring posterolaterally.
后纵韧带是有助于脊柱稳定的三条较为重要的韧带之一。该韧带从枢椎体沿着椎管内椎体的后侧延伸至骶骨。韧带由比前纵韧带更致密的纵向纤维组成。然而，与前纵韧带一样，较致密的纤维更深且跨越一个椎体，而浅层纤维跨越三到四个椎体。浅层是枢椎处覆膜的延续，深层是寰椎处十字韧带的延续。纤维在椎间隙处更宽，并且比起在椎体处（此处纤维更细），它们与椎间盘的纤维环附着更紧密。这种现象在后纵韧带中比在前纵韧带中更明显。因此，后纵韧带比前纵韧带薄得多，这对后外侧椎间盘突出症的病理生理学具有重要意义。
