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