Lateral cephalogram with marked points, lines, and angles presented in Table 1 used to assess head position, cervical vertebrae, and functional spaces. AP—anteroposterior; CV angle—craniovertebral angle; MGP—McGregor’s Plane; NS—nasion-sella line; C0—basiocciput; C1—C3; C5—first, second, third, fifth cervical vertebrae.