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©2013 UpToDate ® Print Email Tissues in the low back that can generate pain External Tissues • Skin • Subcutaneous tissue • Fat Joints • Capsules of facet and sacroiliac joints Ligaments • Longitudinal spinal • Posterior interspinous • Sacroiliac • Ligamentum flavum (minimal pain fiber innervation) Periosteum • Vertebral bodies and arches Dura mater Epidural fibro-adipose tissue Annulus fibrosus Arterioles • Of spinal and sacroiliac joints • Of vertebral cancellous bone Veins • Epidural • Paravertebral Paravertebral muscles • Pain fibers in perivascular connective tissues Courtesy of Kerry Levin, MD.