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Without implantation of a fertilized egg, the endometrial lining is either reabsorbed (estrous cycle) or shed (menstrual cycle). In the latter case, the process of shedding involves the breaking down of the lining, the tearing of small connective blood vessels, and the loss of the tissue and blood that had constituted it through the vagina. The ...
Endometrial hyperplasia is a condition of excessive proliferation of the cells of the endometrium, or inner lining of the uterus.. Most cases of endometrial hyperplasia result from high levels of estrogens, combined with insufficient levels of the progesterone-like hormones which ordinarily counteract estrogen's proliferative effects on this tissue.
The endometrium is richly supplied with blood and its growth is regulated by estrogen and progesterone. [6] It consists of glandular and stroma tissue from the lining of the uterus. [3] When the endometrial mucous membrane is found outside of the uterus in places such as the ovaries, it causes chronic pelvic pain with intercourse and menstrual ...
Meanwhile, the pipelle is rotated and moved outwards from the fundus to the internal os to collect small pieces of endometrial tissue. [5] Recently, the TruTest has been introduced as an alternative method of endometrial biopsy. Rather than using a suction tube, this method uses the Tao Brush to gently brush the lining of the uterus. Generally ...
For instance, mucosa in the stomach protects it from stomach acid, [2]: 384, 797 and mucosa lining the bladder protects the underlying tissue from urine. [8] In the uterus, the mucous membrane is called the endometrium, and it swells each month and is then eliminated during menstruation. [2]: 1019
The underlying causes may include ovulation problems, fibroids, the lining of the uterus growing into the uterine wall, uterine polyps, underlying bleeding problems, side effects from birth control, or cancer. [3] More than one category of causes may apply in an individual case. [3] The first step in work-up is to rule out a tumor or pregnancy.
During the pre-menstrual phase, progesterone secretion decreases as the corpus luteum degenerates, which results in decreased blood flow to the spiral arteries. The functional layer of the uterus containing the glands becomes necrotic, and eventually sloughs off during the menstrual phase of the cycle.
This allows maternal blood to come into direct contact with the fetal chorion, a membrane between the fetal and maternal tissues, and allows for nutrient and gas exchange. However, decidualization-like reactions have also been observed in some species that don't display hemochorial placentation.