OBSbasic
In a cephalic presentation, engagement is defined in the slides by passage of which diameter below the pelvic inlet?
Answer
Biparietal diameter
Explanation
For cephalic presentation, engagement is defined by the **biparietal diameter** passing below the plane of the pelvic inlet. The bitrochanteric diameter is named for breech presentation in the material. **Key takeaway:** Engagement refers to passage of the widest diameter of the presenting part below the inlet.\n\n**Glossary:** **Biparietal diameter**: transverse diameter between the two parietal bones.
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