upper uterine segment

up·per u·ter·ine seg·'ment

the main portion of the body of the gravid uterus, the contraction of which furnishes the chief force of expulsion in labor.
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It is speculated that the uterine muscle section during abdominal delivery interfered with its physiological stretching, and prevented or restricted the placenta moving away to the upper uterine segment in a subsequent pregnancy.

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