Which mechanism of labor occurs when the largest diameter of the fetal presenting part passes the pelvic inlet?
a. Engagement
b. Extension
c. Internal rotation
d. External rotation
A
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A Engagement occurs when the presenting part fully enters the pelvic inlet.
B Extension occurs when the fetal head meets resistance from the tissues of the
pelvic floor and the fetal neck stops under the symphysis. This causes the fetal
head to extend.
C Internal rotation occurs when the fetus enters the pelvic inlet. The rotation allows
the longest fetal head diameter to conform to the longest diameter of the
maternal pelvis.
D External rotation occurs after the birth of the head. The head then turns to the
side so the shoulders can internally rotate and are positioned with their transverse
diameter in the anteroposterior diameter of the pelvic outlet.
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