anatomical, anatomically, back, backbone, backs, bone, bones, brain, brains, column, columns, covering, coverings, disc, discectomies, discectomy, discetomies, discetomy, discs, disectomy, disk, diskectomies, diskectomy, disks, dissectomy, dura, dural, epidural, interspace, intervertebral, l, l-4, l-5, l4, l4-5, l4-l5, l5, layer, layers, low, lower, lumbar, mater, meningeal, meninges, meninx, nerve, nerves, processes, root, roots, space, spinal, spine, spines, spinous, transverse, vertebra, vertebrae, vertebral, 4, 5