This article deal about biomechanics of a cervical spine including anatomy of this region. Muscle tone is the main factor for this work as a factor which influate shape and position of cervical spine especially with the patient with clinical symptomatology of vertebrogenic algic syndroms of cervical spine. There will be used methods as a palpation, visual methods as a NMR and kinematography. Next goal is to find adequate marks in relationship between muscle tone and shape of cervical spine which will be good output for clinical practice.

        Key words: cervical spine, muscle tone, biomechanics of cervical spine