Changing body position alters the location of the spinal cord within the vertebral canal: a magnetic resonance imaging study M.R.B. Ranger, G.J. Irwin,

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Changing body position alters the location of the spinal cord within the vertebral canal: a magnetic resonance imaging study M.R.B. Ranger, G.J. Irwin, K.M. Bunbury, J.M. Peutrell British Journal of Anaesthesia Volume 101, Issue 6, Pages 804-809 (December 2008) DOI: 10.1093/bja/aen295 Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 1 Schematic representation of a transverse section through a lumbar vertebra at the level of the CM. The nerve roots are marked as small open circles; the tip of the spinal cord is indicated by the larger, single closed circle. British Journal of Anaesthesia 2008 101, 804-809DOI: (10.1093/bja/aen295) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 2 The level of the tip of the CM is defined by dividing the vertebral body, including the intervertebral space into four segments: upper, middle and lower thirds, and the intervertebral space.18 British Journal of Anaesthesia 2008 101, 804-809DOI: (10.1093/bja/aen295) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 3 Movement of the CM anteriorly and laterally towards dependent side when changing from the supine to the lateral position with knees and hips flexed. Boxes show medians (Wilcoxon P<0.001) and 25th–75th percentiles, and whiskers show the range. British Journal of Anaesthesia 2008 101, 804-809DOI: (10.1093/bja/aen295) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 4 Supine position; (a) sagittal and (b) axial views of the vertebral column at the level of the CM. British Journal of Anaesthesia 2008 101, 804-809DOI: (10.1093/bja/aen295) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 5 Left lateral position with knees and hips flexed; (a) sagittal and (b) axial views of the vertebral column at the level of the CM. British Journal of Anaesthesia 2008 101, 804-809DOI: (10.1093/bja/aen295) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions