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