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Thin, somewhat transparent ligamentous sheets that connect successive spinous processes from their roots to their apices. Their ventral surface meets the ligamentum flavum and their dorsal margin blends into the supraspinous ligament. They are small and inconspicuous in the cervical region, often being considered part of the nuchal ligament. In the thorax they long and slender and in the lumbar region they are thick and broad.
Limit flexion of the vertebral column.