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