OBSbasic
Flexion helps the smallest diameter of the fetal head pass through the maternal pelvis.
Answer
true
Explanation
Flexion brings the fetal chin toward the chest, allowing the smaller **suboccipitobregmatic diameter** to present. This adaptation reduces the diameter that must negotiate the maternal pelvis. **Key takeaway:** Flexion is mechanically advantageous because it presents a smaller head diameter.\n\n**Glossary:** **Suboccipitobregmatic diameter**: a relatively small fetal head diameter associated with a flexed head.
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