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