7c682e55_RSES__abnormal_uterine_actions__CONSTRICTION_RING
[0] Situation [RETRACTION RING] At the junction of upper and lower segment. The position progressively moves upwards [CONSTRICTION RING] 
Usually at the junction of upper and lower segment but may occur in other places. The position does not alter.
A GUIDE FOR NURSES: abnormal uterine actions
CONSTRICTION RING