![]() The mentum (chin) is the presenting part. The brow or forehead is the presenting part. Anglo-American literature lists 7 cardinal movements, namely engagement, descent, flexion, internal. The top of the head is the presenting part. The fetus negotiates the birth canal and rotational movements are necessary for descent. This is an uncommon fetal position and a vaginal birth is unlikely.Ĭommonly, this skull diameter is too large to pass through the pelvis. ![]() ![]() Many fetuses assume this attitude early in labor but convert to complete flexion as labor progresses. This position is commonly called the fetal position. The back is usually arched, which increases the degree of hyperextension. In complete extension, the head and neck of the fetus are hyperextended and the occiput touches the fetus’s upper back. In partial extension, the head of the fetus is extended, with the head pushed slightly backward so that the brow becomes the first part of the fetus to pass through the pelvis during birth. The breech is in the fundus of the uterus. The small parts are on the right and are not felt clearly. These movements of your babys head are called cardinal movements of labor. These changes are needed for your baby to fit and move through your pelvis. The back is on the left and anterior and is palpated easily except in obese women. As your baby passes through the birth canal, her head will change positions. Moderate flexion (aka military position or sinciput), the head of the fetus is slightly flexed but held straighter than in complete flexion. The long axis of the fetus is parallel to the long axis of the mother. In complete flexion, the head of the fetus is tucked down onto the chest, with the chin touching the sternum.
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