Posterior longitudinal ligament

The posterior longitudinal ligament (PLL) is a long and important ligament located immediately posterior to the vertebral bodies (to which it attaches loosely) and intervertebral discs (to which it is firmly attached).

It extends from the back of the sacrum inferiorly and gradually broadens as it ascends. At the level of C2 (the axis) it spreads out and becomes the tectorial membrane that eventually inserts into the base of skull 1,2.

Anatomy: Spine

Article information

rID: 36586
System: Spine
Section: Anatomy
Synonyms or Alternate Spellings:
  • Posterior longitudinal ligament (PLL)
  • Posterior longitudinal ligaments

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Cases and figures

  • Figure 1
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  • Figure 2: ligaments of the lumbar spine (Gray's illustration)
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  • Figure 3: PLL (Gray's illustration)
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