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Disc Herniation. . . Weakened annulus fibrosus causes the nucleus pulposus to bulge. out. Types of disc herniations:5. Protrusion- disc bulges posteriorly without. tearing the annulus fibrosus. Prolapse- the outermost fibers of the annulus. fibrosus contain the nucleus. Extrusion- the annulus fibers are perforated.
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