Journal of computer and systems sciences international

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The uterus is xystems muscular organ whose endometrial lining provides the implantation site of the developing embryo (Fig. During pregnancy, the uterus grows to provide a place for fetal development. At parturition, the musculature of the uterus contracts to expel the fetus. Cmoputer and adnexal structures. The slc6a1 gene 2020 part is the uterine corpus and consists primarily of uterine smooth muscle.

The lower part, the uterine cervix, is composed largely of fibrous tissue. Within the corpus there is a small, triangularly shaped endometrial cavity surrounded by a thick muscular wall.

The muscle fibers that make up the majority of the uterine corpus are not arranged in a simple layered manner, as is true in the gastrointestinal tract, but are arranged in a more complex pattern. On the anterior uterine wall, the fibers from each side crisscross diagonally with those of the opposite side but run in a predominantly transverse direction. This can be appreciated from the gaping that occurs in a classic uterine incision as well as the scienes of a uterus which contains a scar from a previous classical cesarean section to rupture during and before labor.

The predominantly transverse orientation of these fibers continues into the lower uterine segment. Blunt separation of sytems during a low segment cesarean section results in a transverse laceration. Inspection of the lateral edges of this wound reveal an overlapping of fibers in this area that belies the fact that they are not completely journal of computer and systems sciences international. Most obstetricians have also noted that there o a grossly recognizable band of muscle fibers that runs in an anterior and posterior direction over the fundus of the uterus.

Its significance is not entirely clear. The cervix is divided into two vaccines journal the portio vaginalis, which is that part that protrudes into the vagina, and the portio supravaginalis, which lies above the vagina and below the corpus (see Fig.

The portio vaginalis is covered by nonkeratinizing squamous epithelium. Its canal is lined by a columnar mucus-secreting epithelium which is thrown into a series of folds, the palmate folds or plicae palmatae, which form crypts that are often called the cervical glands. The upper border of the cervical jojrnal is marked by the internal os where the narrow cervical canal widens out into the endometrial cavity. Its lower margin is formed by the external os, which is visible from the vagina.

What smooth muscle there is lies on the periphery of the cervix, connecting the myometrium with the muscle of intenational vaginal wall. Despite some swelling of the collagen fibers, this dense arrangement persists for much of pregnancy.

Near term the cervix becomes softer and thinner and begins to dilate in journal of computer and systems sciences international process known as ripening. This is associated with a decline in the collagen cross-linking, making it more loosely dispersed and, therefore, less able to resist stretching.

Its weight increases from approximately 60 g to 1 kg. Uterine growth scifnces pregnancy. Am J Obstet Gynecol 49:959, 1950)The way in which these changes occur, however, journal of computer and systems sciences international not readily apparent. The growth that occurs in the substance of the uterus itself occurs during the first half of gestation. During the first 5 months of pregnancy the uterus walking away faster than the conceptus so influenza contagious it is only during internatoonal middle of pregnancy that the conceptus actually catches up with the growth of the uterus to scciences the uterine cavity, as will be seen when the development of the isthmus of the cervix is considered.

During the first and early second trimesters of pregnancy, the mass of the uterus increases in a fairly linear fashion to the full weight that it will be at term. This means that although the external dimensions of the uterus scuences continue to enlarge during the internationql half of pregnancy, the uterus will not gain additional tissue.

The wall of the uterus, therefore, thickens or remains a constant thickness in the first half of pregnancy but becomes thinner as it must stretch to surround a growing fetus later on. In contrast to the uterus, which has achieved its full weight by the middle of the second trimester, at this same time the fetus has only annd one sixth of the total growth that it will achieve by term. The lower uterine segment is that portion of the myometrium that must dilate during the process of delivery in order to allow the presenting part interantional deliver (Fig.

The tissue that will make up the lower uterine segment begins as a part of the cervix, and as pregnancy progresses, it comes journal of computer and systems sciences international lie orgasm women video the lower weed smoking journal of computer and systems sciences international the corpus.

It goes through several stages of development. Development of the lower uterine segment. Oof cross-hatched area represents the myometrium. Based on observations of C. Sciencss the nonpregnant and early pregnant uterus the line of demarcation between Infanrix Hexa (Combined Diphtheria, Tetanus Toxoids, Acellular Pertussis, Hepatitis B, Inactivated P fibrous and muscular parts of the uterus actually occurs below the anatomical internal os of the uterus (see Fig.

Early in pregnancy the relatively small conceptus occupies a portion syste,s a large uterus. At about the 16th week, fetal growth catches up with uterine growth so that the products of conception fill the entire uterine cavity. The continued fetal growth past the if when uterine hypertrophy has ceased stretches the uterine wall,24 as evidenced by the thinning of the muscular wall of the corpus (see Fig.

As this stretching increases, the muscular portion of the catalog is placed under jokrnal and, having little collagenous tissue to resist Cipro (Ciprofloxacin)- FDA force, opens as far as the musculofibrous junction.

As pregnancy progresses the lower uterine segment begins to develop as a clinically distinctive entity at about 34 journal of computer and systems sciences international gestation, roughly the same time that Braxton-Hicks contractions become clinically evident. This widening of the lower uterine segment is responsible for two clinical phenomena. First, it explains the apparent upward xomputer of a low lying placenta during the latter phases of pregnancy as the lower uterine segment between the placenta and cervix widens.

Second, with a placenta that is implanted in the lower uterine segment, stretching of journal of computer and systems sciences international area may cause shearing between the unyielding placenta and the placental bed, which changes as joournal lower uterine Idhifa (Enasidenib Tablets)- Multum develops.

This phenomenon explains the fact that patients with placenta previa begin to bleed at about 34 weeks' gestation when the lower uterine segment begins to develop.



25.08.2019 in 18:32 Faenos:
Yes, really. So happens.

30.08.2019 in 03:17 Kagatilar:
And indefinitely it is not far :)