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Their name means the yellow ligament, a name which arises from the fact that they have a large percent of yellow elastic tissue. These fibers course form the superior border of one lamina to the inferior border of the lamina above. They are broad, thin ligaments that span from the posterior surface of the joint capsules laterally to the root of the spinous process medially. They become increasingly thicker from the cervical to the lumbar region.
Limit vertebral flexion and possible assist in returning the vertebral column to the erect position.