Lateral curvature of the spine and round shoulders . rsal region bends as a whole upon the lumbar and rocksover to the side practically unchanged, being locked against side bending by thehyperextended position. Side bending, therefore, is situated highest in the flexed position, lower downin the erect position, and lowest in hyperextension in the model cadaver, andchUd. Rotation Accompanyitig Side Beftding in the Hyperextended Position.—This isa sharply limited movement occurring in the lumbar region, including the 36 THE MOVEMENTS OF THE SPINE twelfth dorsal as functionally a lumbar vertebra.
Lateral curvature of the spine and round shoulders . rsal region bends as a whole upon the lumbar and rocksover to the side practically unchanged, being locked against side bending by thehyperextended position. Side bending, therefore, is situated highest in the flexed position, lower downin the erect position, and lowest in hyperextension in the model cadaver, andchUd. Rotation Accompanyitig Side Beftding in the Hyperextended Position.—This isa sharply limited movement occurring in the lumbar region, including the 36 THE MOVEMENTS OF THE SPINE twelfth dorsal as functionally a lumbar vertebra. The thorax rocks over to theside unchanged, and the rotation of the bodies is to the concave side of the lateralcurve. Rotation accompanying side bending is, therefore, of a different type in theflexed position of the spine from what it is in the erect or hyperextended position. III^. ROTATION Rotation or twisting of the spine is to be considered as part of a compoundmovement of which side bending forms the other part. For purposes of simplicity. Fig. 25.—Side Bejtoing to the Right in the Hyperextended Position of the Spine IN THE head is supported to secure steadiness. the rotation element of the movement will be considered by itself. Under or-dinary conditions it is essentially a movement of the dorsal and cervical regionsin which the lumbar vertebras take but little part except in hyperextension andwith the use of traction. The lumbar vertebral region possesses some power ofrotation, as has been generally observed. ROTATION 37 Rotation in the Erect Position.—Rotation is freest in the erect position andis 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,where it disappears. With very forcible rotation applied 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
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