From the external occipital protuberance to the waist, there is a supraspinous ligament connected to the spinous process behind, with long fibers. Generally, it is manifested as a thick and thick nuchal ligament, which plays an important role in the stability of the occipital neck; in the thoracic segment, the supraspinous ligament is relatively weak; while the supraspinous ligament of the lumbar spine is also strong, but in the lumbar5to Sacrum1is often absent or relatively weak, which is prone to cause injury to the deep interspinous ligament.
