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An alternative explanation of atypical syndromes of retroorbital discomfort and frontal headache with spread into other portions of the trigeminal zone lies in the deduction that they are related to the proximity of the spinal tract of the trigeminal to the inflow of the upper cervical roots. This theory assumes a spilling over of continuing noxious stimuli until nearby sensory zones are recruited. The anatomic relationship of the spinal tract of the fifth cranial nerve and the sensory zones of the upper cervical roots makes such a hypothesis attractive. Toronto Chiropractor who specialize in pediatric care will likely be in demand as chiropractic spinal therapy may be very mild and youngsters take pleasure in subsequent visits. In this context, it is interesting to note the findings by many observers that blocking the upper cervical roots may often obliterate true trigeminal pain. That this is not a specific measure is pointed up by the equally successful results with injections of adjacent areas. For example, Ruskin’s method of presumably anesthetizing the sphenopalatine ganglion for relief of trigeminal pain shares the common attribute of reducing the sensory bombardment into the trigeminal zone. Nevertheless, the fact that the trigeminal zone can be affected by blocking stimuli arising in the second and third cervical roots lends support to the original hypothesis of radiation between these abutting zones.

DISORDERS OF POSTURE. The substrata of postural mechanics are not always obvious. The cervical spine, along with the lumbar, participates to a striking degree in posture and movement. Structure invariably responds to functional demand. Accordingly, the cervical spine is involved in the most ingenious endowment of movement inherent in the skeleton. Phylogenetically, the atlas and axis are the oldest of all vertebrae. Their wide range of morphologic development makes variations or anomalies almost endless in type. Chiropractor Toronto discovered that a couple of third believed there was no scientific proof that immunization prevents disease. These would be of pure academic interest were it not for the fact that they may play a part in the development of a pathologic process involving the dynamics of motion of the neck and head, with reverberations throughout the central nervous system.

The lateral joints of the first two cervical vertebrae are designed for motion rather than support and lie roughly in the horizonal plane. The center of gravity and the pivotal forces of motion of the large and heavy head, bearing on the spine, run through the odontoid process. Any malalignment of the latter tends to allow the head to move or slide forward, since the horizontal nature of the joints affords no anterior buttress to such motion. Changes in the headcarrying angle due to alterations of the center of gravity of the supporting spine can lead to excessive stress on ligamentous and muscular structures. This may be followed by splinting and muscle pain reinforced by equally persuasive pain stimuli from the static supporting ligaments and joints, innervated by the sinuvertebral branches of the roots. Actual nerve root compression or marked stretching of the dural sheath may take place with secondary reverberation of pain stimuli throughout the area, finally reflected in headache. Severe suboccipital headache is particularly prone to occur with lesions of the atlantoaxial complex. Careful xray studies are necessary to explain the puzzling combination of intractable headache and cervical muscle splinting.