Principles and practice of spinal adjustment; for the use of students and practitioners . o points to compensate for the eccentric load ithas to support. These curves due to deflection are carried upon the head produce peculiar types of back,resulting in curvatures, cretinism, thyroidism, and similar dis-eases which previously had not a satisfactory etiology. Thecervicals, being the weakest, give way first; hence we see thethyroid type in European mountainous districts, where drink-ing water has been erroneously accused of causing cretinism,etc. The lower cervical vertebrae bec
Principles and practice of spinal adjustment; for the use of students and practitioners . o points to compensate for the eccentric load ithas to support. These curves due to deflection are carried upon the head produce peculiar types of back,resulting in curvatures, cretinism, thyroidism, and similar dis-eases which previously had not a satisfactory etiology. Thecervicals, being the weakest, give way first; hence we see thethyroid type in European mountainous districts, where drink-ing water has been erroneously accused of causing cretinism,etc. The lower cervical vertebrae become subluxated, so thatadjustments here relieve thyroid troubles. Any muscular con-tractions approximate the vertebrae or pull them out of lineif daily persisted in; hence, occupational diseases. Every mo-tion causes a pose or attitude; a persistence of attitude causesa subluxation or a tendency thereto. Besides tension and compression there are two otherforces acting through the spine, namely shearing (slipping)and torsion (turning). The whole argument rests upon 24 SPINAL ADJUSTMENT. Fig. 3. BASIS OF CHIROPRACTIC 25 whether the vertebrae can slip or sHde in respect to one an-other. We know that in turning the head and trunk withrespect to the hips, that the vertebrae twist slightly in respectto their fellows. Question: Can a condition occur in whichtwisting is so great as to cause pressure on the spinal nerveswhich pass through the lateral openings? Dissection of spinalvertebrae shows such pressure does take place with conse-quent atrophy or degeneration. The next question that naturally arises is: Assuming thatvertebral subluxations may occur, does enough displacementoccur to produce pressure upon the structures passing throughthe intervertebral foramina ? This question has been answeredat length in the preceding chapter, and leaves little to be must be remembered that it requires very little pressureupon a nerve to destroy its power of conductivity, and
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