Final answer:
The thickest portions of the anterior longitudinal ligament and the supraspinous ligament are found in the cervical and lumbar regions of the vertebral column.
Step-by-step explanation:
The thickest portions of the anterior longitudinal ligament and the supraspinous ligament are found in the cervical and lumbar regions of the vertebral column.
The anterior longitudinal ligament runs along the anterior surface of the vertebral bodies and helps prevent hyperextension of the vertebral column. The thickest portion of this ligament is found in the cervical region.
The supraspinous ligament runs along the posterior surface of the spinous processes and helps stabilize the vertebral column. The thickest portion of this ligament is found in the lumbar region.