The supraspinous ligament (supraspinal ligament) is a strong cord-like band that connects the apices of adjacent spinous processes. It arises from the tip of the spinous process of the seventh cervical vertebra (C7) (Read more!) and extends downward along most of the length of the spine. The supraspinous ligament terminates at the level of the lower lumbar vertebrae (most commonly at the L4) or the sacrum.

The supraspinous ligament consists of three layers:

Superficial layer - connects three to four vertebrae;
Middle layer - extends over two to three vertebrae;
Deep layer - links the adjacent spinous processes.

The supraspinous ligament is thicker and broader in the lumbar region (Read more!) than in the thoracic spine (Read more!). In the anterior direction, it is continuous with the interspinous ligaments (Read more!). From the C7 level towards the skull, the supraspinous ligament continues as the nuchal ligament (Read more!).

The supraspinous ligament limits flexion of the spine, prevents its hyperflexion and provides resistance to the separation of spinous processes.

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Supraspinous ligament