The 6-Second Trick For Lumbar disc nomenclature: version 2.0 - The Spine Journal

The posterior longitudinal ligament (PLL) affords only weak midline reinforcement, specifically at L4-5 and L5-S1, as it is a narrow structure connected to the annulus. The anterior and middle fibers of the annulus are most various anteriorly and laterally however lacking posteriorly, where many of the fibers are connected to the cartilage plate.

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The anterior column (black dotted line) includes the anterior spinal ligament, the anterior annulus fibrosus (AF), the intervertebral disc, and the anterior two thirds of the vertebral bodies. The middle column (red dotted line) consists of the posterior aspect of the vertebral bodies, the posterior annulus fibrosus, and the posterior longitudinal ligament (PLL).

ALL = anterior longitudinal ligament; ISL = interspinous ligament; LF = ligamentum flavum; NP = nucleus pulposus; SSL = supraspinous ligament. The annular fibers are firmly connected to the vertebral bodies and are arranged in lamellae. This annular plan allows restricting vertebral movements, strengthened by investing ligaments.  I Found This Interesting  covers the forward surface areas of lumbar vertebral bodies and discs.

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The ALL keeps the stability of the joints and limitations extension. The PLL lies within the vertebral canal over the posterior surface area of the vertebral bodies and discs. It functions to restrict flexion of the vertebral column, except at the lower L-spine, where it is narrow and weak. The supraspinous ligament signs up with the tips of the spinous procedures of adjacent vertebrae from L1-L3.

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Often described together as the interspinous/supraspinous ligament complex, they weakly resist spinal separation and flexion. The ligamentum flavum (LF) bridges the interlaminar period, connecting to the interspinous ligament medially and the aspect capsule laterally, forming the posterior wall of the vertebral canal. It has a broad attachment to the undersurface of the remarkable lamina and inserts onto the leading edge of the inferior lamina.

It maintains consistent disc tension. The intertransverse ligament signs up with the transverse procedures of adjacent vertebrae and withstands lateral flexing of the trunk. The iliolumbar ligament occurs from the idea of the L5 transverse procedure and links to the posterior part of the inner lip of the iliac crest. It helps the lateral lumbosacral ligament and the ligaments pointed out above support the lumbosacral joint (see the following images).