Principles and practice of spinal adjustment; for the use of students and practitioners . pon the other. Thismovement is in various directions depending on the configura-tion of the articular processes and the manner of applicationof the forces which produce the displacement. These variousforms of subluxations will be considered in detail in a futurechapter. When displacement of a vertebra occurs, the lumen ofthe intervertebral foramen must of necessity be encroachedupon by the displaced portions, and its opening fact rests upon the physical axiom that, any movementtoward the cen
Principles and practice of spinal adjustment; for the use of students and practitioners . pon the other. Thismovement is in various directions depending on the configura-tion of the articular processes and the manner of applicationof the forces which produce the displacement. These variousforms of subluxations will be considered in detail in a futurechapter. When displacement of a vertebra occurs, the lumen ofthe intervertebral foramen must of necessity be encroachedupon by the displaced portions, and its opening fact rests upon the physical axiom that, any movementtoward the centre of an opening of the parts bounding it,diminishes its area. Further, whatever is contained in aspace so diminished in area is either compressed or it is softer than the parts pressing upon it, compression willoccur. This is what occurs in vertebral subluxations, wherehard bone presses on soft nerves, blood-vessels, and lym-phatics. This, then, is what is meant by vertebral subluxation,namely, a displacement of a vertebra, resulting in an impinge- 174 SPINAL ADJUSTMENT. Fig. 38. Anterior Aspect of Spine. (A and B) Compression of the right side of the discs between the first, sec-ond, and third dorsal vertebrae with approximation of these vertebrae on thatside and narrowing of the intervertebral dorsal foramina. (C) Lateral displacement of the fifth dorsal vertebra to the left. (D, E, and F) Compression of the anterior portion of the discs between theninth, tenth, eleventh, and twelfth dorsal vertebrae. (G) Rotary displacement of the second lumbar vertebra to the right side. (II) Compression of the right side of the disc between the fourth and fifthliunbnr vertebrae. VERTEBRAL MAL-ALIGNMENT 175 nient of the structures in the intervertebral foramen by thedisplaced mari^ins of the foramen. General Results of Mal-Alignment of the Vertebrae.—Minor vertebral lesions, as has been repeatedly mentioned,produce certain diseases. It is not intended to convey the im-press
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