spinal induction

spi·nal in·duc·tion

the manner in which one sensory stimulus lowers the threshold for another.
Farlex Partner Medical Dictionary © Farlex 2012
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Especially in pregnant women, the width of the hips is usually larger than that of the shoulders which result in a head-down tilt when lying in the lateral position.[sup][27] And this may contribute to less failure of spinal induction in our study.