. Lateral curvature of the spine and round shoulders . e but little part except in hyperextension and with the useof traction. The lumbar vertebral region possesses some power of rotation, as hasbeen generally observed. Rotation in the Erect Position.—Rotation is freest in the erect positionand is situated in the cervical and dorsal regions, reaching its maximum at the topof the cervical column and extending down the spine to the lower dorsal region. 32 THE MO\TEMENTS OF THE SPINE. where it disappears. With very forcible rotation appHed to the top of the columnin the cadaver, the first and eve
. Lateral curvature of the spine and round shoulders . e but little part except in hyperextension and with the useof traction. The lumbar vertebral region possesses some power of rotation, as hasbeen generally observed. Rotation in the Erect Position.—Rotation is freest in the erect positionand is situated in the cervical and dorsal regions, reaching its maximum at the topof the cervical column and extending down the spine to the lower dorsal region. 32 THE MO\TEMENTS OF THE SPINE. where it disappears. With very forcible rotation appHed to the top of the columnin the cadaver, the first and even the second lumbar vertebra; may be rotation in this position is accompanied by a side bend of the rotated regionaway from the side to which the bodies of the vertebrae turn. If the rotation isto the right, it is accompanied by a bend convex to the left and vice versi. In themodel an active rotation to the right is accompanied by a displacement of the trimkto the left side and vice versa. If traction is applied to the head of the erect. Fig. 27.—Rotation of the Model, Face to the Right, Causing a Dorsal LateralCurve Convex to the Left and a Displacement of the Trunk to the Left. cadaver, forcible twisting of the head results in rotation of the lumbar vertebraeincluding the fourth. Rotation in the Flexed Position.—Rotation in the flexed position ofthe spine occurs chiefly in the cervical and upper dorsal spine, the lower dorsaland lumbar region seeming locked against rotating forces by the flexed more extreme the flexion the more markedly in cadaver, model, and child isthe rotation restricted to the cervical and upper dorsal spine. ROTATION. 33 Rotation in the Hyperextended Position.—In hyperextended positionsrotation with moderate manual force occurs as a twisting of the whole thorax onan axis in the dorsolumbar region, the upper and middorsal regions apparentlybeing locked against rotation by hyperextension. The site of rotating movementin thi
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