A bundle of muscles and tendons that is paired and runs more or less vertically. It extends throughout the lumbar, thoracic and cervical regions, and lies in the groove to the side of the vertebral column. [ http://en.wikipedia.org/wiki/Erector_spinae_muscles ]

Synonyms: erector spinae extensor spinae extensor spinae muscles sacrospinalis

This is just here as a test because I lose it