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