The interspinous ligaments (interspinal ligaments) are thin, weak, and membranous bands that stretch between the spinous processes of adjacent vertebrae. They attach along the apexes and bases of the spinous processes.

Anteriorly, the interspinous ligaments fuse with the yellow ligaments (Read more!). Posteriorly, they merge with the nuchal ligament (Read more!) in the cervical spine and with the supraspinous ligament (Read more!) below the C7 level.

The cervical interspinous ligaments are only slightly developed. Some authors even state that they are absent in the cervical spine. While some describe them as part of the nuchal ligament, others consider them distinct interspinous fascicles.
The thoracic interspinous ligaments are narrow and elongated.
The lumbar interspinous ligaments are the best developed. They are thicker, broader and appear quadrilateral-shaped.

The interspinous ligaments limit flexion of the spine and resist the separation of the laminae during flexion.

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Interspinous ligaments