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Saggital section specimen of the L3–L4 intervertebral disc of a middle aged asymptomatic male subject. NP nucleus pulposus, IA inner annulus fibrosus, OA outer annulus fibrosus. Defects in the outer annulus (asterisk) and tears (hat symbol) are visible in the outer annulus, without a sign of herniation. The NP has a severely dehydrated appearance due to conservation techniques
