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Pelvimetry is the measurement of the female pelvis. [1] It can theoretically identify cephalo-pelvic disproportion, which is when the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal. However, clinical evidence indicate that all pregnant women should be allowed a trial of labor regardless of pelvimetry results.
Being upright during labour and birth can increase the available space within the pelvis by 28–30% giving more room to the baby for rotation and descent. There is also a 54% decreased incidence of foetal heart rate abnormalities when the mother is upright. [ 9 ]
Hence females generally have wider hips, permitting childbirth. Because the female pelvis is flatter, more rounded and proportionally larger, the head of the fetus may pass during childbirth. [9] The sacrum in females is shorter and wider, and also directed more toward the rear (see image). [10]
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 chil
Presentation of twins in Der Rosengarten ("The Rose Garden"), a German standard medical text for midwives published in 1513. In obstetrics, the presentation of a fetus about to be born specifies which anatomical part of the fetus is leading, that is, is closest to the pelvic inlet of the birth canal.
In addition to bipedal locomotion, the reduced strength of the pelvic floor due to a wider maternal pelvis also leads to fitness detriments in the mother pressuring the birth canal to remain relatively narrow. [3] [4] This idea was widely accepted when first published in 1960, but has since been criticized by other scientists. [5]
During childbirth, women are more likely to develop vaginal introital laxity, eventually leading to the weakening of pelvic floor muscles and may develop urinary symptoms such as OAB. [ 7 ] Vaginal introital laxity may also weaken the support structures around the urethra , which is the tube that helps carry urine outside of the body from the ...
Pregnancy is the period of time during which the fetus develops, dividing via mitosis inside the uterus. During this time, the fetus receives all of its nutrition and oxygenated blood from the mother, filtered through the placenta , which is attached to the fetus' abdomen via an umbilical cord .