The cervical spine.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D002574:Cervical Vertebrae / Q000033:anatomy & histology / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009068:Movement; D009790:Occupations; D012399:Rotation