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