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