Memory Game medical terminology word rootOnline version to know more about root words in skeletal system by mohamed said Sacrum Cranium -crani- -rachi- Vertebral spine, vertebral column Relating to the lumbar region of the spine Relating to the petrous portion of the temporal bone -petr- -sacr- -lumb- -clavic- / -clavicul- -pelv/i- -spondyl- / - vertebr- Clavicle, collarbone Sternum, breastbone -cost- Pelvis, pelvic bone Ribs Vertebra, spine, vertebral column -stern-