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