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