Anterior Longitudinal Ligament

Description

Running along the anterior surfaces of the vertebral bodies, the anterior longitudinal ligament forms a continuous band from the inferior aspect of the occiput and anterior arch of C1 down across the cervical, thoracic, and lumbar spine to the anterior surface of the sacrum. Superiorly, the skull is presented in anterior aspect, while the vertebral column descends in the midline to the pelvis, with the intervertebral discs interposed between adjacent vertebral bodies. Broadest over the vertebral bodies and more constrained at the disc levels, the ligament maintains an intimate relationship with the anterior annulus fibrosus across each motion segment. Clean midline anatomy. Clinically, this is the restraint that limits hyperextension and helps maintain sagittal alignment across the cervical and lumbar regions where extension moments are common. Anterior osteophytes in degenerative spondylosis often develop along its attachment sites, and in diffuse idiopathic skeletal hyperostosis (DISH) the ligament can ossify into flowing anterior bridges across multiple vertebral levels, a pattern that radiologists and spine surgeons recognize immediately. The long, uninterrupted course also explains why anterior approaches to the spine (for example, anterior cervical discectomy and fusion) encounter and typically incise the anterior longitudinal ligament to access the disc space and vertebral body. Ideal for gross anatomy teaching on the axial skeleton, spinal ligaments, and intervertebral disc relationships, with enough continuity to support discussions of cervical through sacral regional differences in a single plate. It also suits orthopedic and neurosurgical texts covering anterior spinal exposure, as well as radiology education pairing this anatomy with CT or lateral radiographs where anterior bridging and ossification patterns are assessed. Anatomical accuracy verified by SciePro's Medical Advisory Board.