Intercristal line as palpation landmarks to identifying the vertebral level is frequently inaccurate.To find more safe and reliable body surface markers and convenient methods to be solved in clinical work.The investigators performed a two-stage study to evaluated the accuracy of intercristal line and the The Posterior Superior Iliac Spine (PSIS) line to identify the lumbar interspinous spaces for spinal anesthesia using ultrasonography in pregnant woman which will provide a second option.
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The distance between the PSIS line and each mid-interspinous space
Timeframe: three days
The accuracy of the anatomic landmarks to determine the L3/4 interspinous space
Timeframe: three days