Which factor ensures that the smallest anterior-posterior diameter of the fetal head enters the pelvis?
a. Descent
b. Engagement
c. Flexion
d. Station
C
The anterior-posterior diameter of the head varies with how much it is flexed. In the most favorable situation, the head is fully flexed and the anterior-posterior diameter is the suboc-cipitobregmatic, averaging 9.5 cm.
Descent is the moving of the fetus through the birth canal.
Engagement occurs when the largest diameter of the fetal presenting part has passed the pel-vic outlet.
The station is the relationship of the fetal presenting part to the level of the ischial spine.
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