[Changes in the thickness of the myometrium during labor].
During labor at term, an ultrasonic technique was used to study changes occurred in myometrium thickness in different uterine portions in 46 females. Immediately after the birth of a child, the most thickness of the myometrium was shown to be in the lower uterine segment; the least, in the uterine fundus and beneath the placenta. Within the third period of the labor, reverse changes occurred when the afterbirth was cast from the uterus. The cross section of the uterine wall may serve as a diagnostic sign of placental discharge. At the end of the second period of the labor, there was an asymmetric decrease in the amniotic cavity mainly due to the corporeal site of the placenta in the puerperium. A possible role of uterine hemodynamics in the mechanism of placental discharge and fetal advance along the maternal passages is also discussed.
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D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D009215:Myometrium / Q000033:anatomy & histology*; D010920:Placenta / Q000033:anatomy & histology; D049590:Postpartum Period; D011247:Pregnancy; D014463:Ultrasonography
Izmenenie tolshchiny miometriia vo vremia rodov.