OBSbasic
The lecture defines placenta praevia as placental implantation wholly or partly in the _____ uterine segment.
Answer
lower
Explanation
Placenta praevia is implantation of the placenta wholly or partly in the **lower uterine segment**. The relationship of the placenta to the internal cervical os provides the basis for the four types described in the lecture.\n\n**Key takeaway:** Placenta praevia involves placental implantation in the lower uterine segment.\n\n**Glossary:** **Lower uterine segment (LUS)**: The lower portion of the uterus; **internal os**: The internal opening of the cervix into the uterus.
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