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The endometrium is central, echogenic (detectable using ultrasound scanners), and has an average thickness of 6.7 mm. During pregnancy, the glands and blood vessels in the endometrium further increase in size and number.
Uterine contractions are a vital part of natural childbirth, [6] which occur during the process of labour and delivery, (typically this excludes caesarean section). These labour contractions are characterized by their rhythmic tightening and relaxation of the myometrium , the most prominent uterine muscle.
Women's endometrium contains relaxin, which is an essential component that helps prepare the body for early pregnancy. [21] The endometrium is transformed into decidua during the early pregnancy maintenance procedure. [21] The process known as decidualization occurs when the endometrium changes both physiologically and morphologically in order ...
There is currently no definitive scientific explanation for why labour is painful. According to studies, during pregnancy, the myometrium (the muscle part of the uterus) is greatly denervated. [27] Stretch receptors in the uterus disappear during pregnancy, and stretch receptors in the cervix disappear at the onset of labour. [28]
One ovum is released and it passes through the fallopian tube into the uterus. Hormones produced by the ovaries prepare the uterus to receive the ovum. The lining of the uterus, called the endometrium, and unfertilized ova are shed each cycle through the process of menstruation. If the ova is fertilized by sperm, it attaches to the endometrium ...
During this process, the uterus grows to accommodate the growing fetus. [23] When normal labor begins, the uterus forcefully contracts as the cervix dilates, which results in delivery of the infant. [23] In the absence of pregnancy, menstruation occurs. [22]
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The decidua is the modified mucosal lining of the uterus (that is, modified endometrium) that forms every month, in preparation for pregnancy. It is shed off each month when there is no fertilized egg to support. [1] The decidua is under the influence of progesterone. Endometrial cells become highly characteristic.