spondylolisthesis, portion, junction, region, segment, pregnancy, anastomosis, spondylolysis, part, organizer, pregnancies, coarctation, type, area, nucleus, canal, lumen, portions, defect, level, epithelium, hypoplasia, cells, mucosa, end, reservoir, segments, nuclei, tegmentum, tube, rupture, musculature, formation, wall, defects, sphincter, variety, obstruction, lesion, zone, games, complex, gestations, section, lysis, stump, coarctations, resection, fissure, myometrium, tone, regions, implantation, nodule, branch, fracture, spl, stenosis, reversal, muscle, aorta, fluid, crypts, route, block, origin, tissue, hypertrophies, hypotonia, transport, lesions, ectopics, ampullary