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