cardinal movements of the mechanism of labor Correct-Engagement and descent
Flexion
Internal rotation to occipitoanterior
position
, Exam 2- NUR 221 Questions and Answers 100% Solved
Extension
External rotation beginning (restitution)
External rotation
expulsion
Engagement Correct-when the fetus moves their head past the pelvic inlet, the head is
said to be engaged. occurs before active labor, while abdominal muscles are more relaxed.
Asynclitism Correct-Oblique presentation of the fetal head at the superior strait of the
pelvis; the pelvic planes and those of the fetal head are not parallel
Descent Correct-refers to the progress of the presenting part through the pelvis. depends
on 4 forces. 1. pressure exerted by the amniotic fluid. 2. direct pressure exerted by the
contracting fundus on the fetus. 3. Force of the contraction of the maternal diaphragm and
the abdominal muscles in the second stage of labor. 4. extension and straightening of the fetal
body
Stations of descent Correct-
, Exam 2- NUR 221 Questions and Answers 100% Solved
Flexion Correct-as soon as the head reaches resistance from the cervix, pelvic wall or
pelvic floor. it normally flexes so the chin makes contact with the fetal chest
Internal Rotation Correct-The maternal pelvic inlet is widest in the transverse diameter,
therefore the fetal head passes the inlet into the true pelvis in the occipitotransverse position.
for the fetus to exit the head must rotate. internal rotation begins at the level of the ischial
spines but is not complete until the presenting part reaches the lower pelvis. as the occiput
rotates anteriorly the face rotates posteriorly. with each contraction the pelvic bones and
muscles guide the fetal head. almost always rotated by the time it reaches pelvic floor
Extension Correct-when the fetal head reaches the perineum for birth it is deflected
anteriorly by the perineum. the occiput passes under the lower border of the symphysis of
pubis first and the head emerges by extension. first the occiput then the face and finally the
chin
restitution and external rotation Correct-After head is born it rotates briefly to the position
it occupied when it was engaged in the inlet. this movement is referred to as restitution. The
45-degree turn realigns the infants head with his or her back and shoulders. the head can
then be seen to rotate further. this external rotation occurs as the shoulders engage and
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