Fig. 7. Proximity curves to the lumbar plexus for perpendicular needle advancement for all lengths of vectors (mean ± SEM) directed from the posterior superior iliac spine (PSIS) towards the spinous process of L3. (  A ) Vector length given in millimeters. (  B ) Vector length given in portions of the distance from the PSIS to the L3 spinous process. 

Fig. 7. Proximity curves to the lumbar plexus for perpendicular needle advancement for all lengths of vectors (mean ± SEM) directed from the posterior superior iliac spine (PSIS) towards the spinous process of L3. (  A ) Vector length given in millimeters. (  B ) Vector length given in portions of the distance from the PSIS to the L3 spinous process. 

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