[1][2] They take the form of relatively weak sheets of fibrous tissue and are well developed only in the lumbar region.

They meet the ligamenta flava anteriorly,[4][better source needed] and blend with the supraspinous ligament[3] posteriorly at the apexes of the spinal processes.

The function of the interspinous ligaments is to limit ventral flexion of the spine and sliding movement of the vertebrae.

They are broader, thicker, and quadrilateral in form in the lumbar region.

[4][better source needed] This article incorporates text in the public domain from page 291 of the 20th edition of Gray's Anatomy (1918)