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In the vertex presentation, the occiput typically is anterior and thus in an optimal position to negotiate the pelvic curve by extending the head. In an occiput posterior position, labor becomes prolonged, and more operative interventions are deemed necessary. [4] The prevalence of the persistent occiput posterior is given as 4.7%. [4]
Occipitoposterior—the occiput faces posteriorly (absolutely straight without any turning to any of the sides) Face presentation Mentum anterior—the fetal chin is in the direction of the maternal pubic symphysis. Mentum posterior—the fetal chin is in the direction of the maternal sacrum. This presentation is not compatible with vaginal ...
The fetal head, from an obstetrical ... from the chin to the most prominent portion of the occiput; ... The head position and degree of skull ossification result in a ...
In obstetrics, position is the orientation of the fetus in the womb, identified by the location of the presenting part of the fetus relative to the pelvis of the mother. Conventionally, it is the position assumed by the fetus before the process of birth, as the fetus assumes various positions and postures during the course of childbirth .
Minor cases present mild molding and the slight deviation of the head from the midline, but are otherwise absent of major fetal head malpositioning. In cases that present with persistent occiput posterior - in which the head is in a downward position, but facing towards the front of the abdomen - or shoulder positions, this can result in ...
The side where there is resistance to the descent of the fingers toward the pubis is greatest is where the brow is located. If the head of the fetus is well-flexed, it should be on the opposite side from the fetal back. If the fetal head is extended though, the occiput is instead felt and is located on the same side as the back.
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The position on the baby's head is checked. The fetal head is then rotated to the occiput anterior position if it is not already in that position. An episiotomy may be performed if necessary. The baby is then delivered with gentle (maximum 30 lb f or 130 Newton [7]) traction in the axis of the pelvis. [8] [page needed]