The uterus export usa is an organ belonging to the female reproductive tract nearly all mammals, ex

The uterus export usa is an organ belonging to the female reproductive tract nearly all mammals, export usa including humans. It has as main function to receive and deploy the embryos as well as being responsible for the expulsion of the fetus at delivery, through contractions.
Morphologically, has pear-shaped, and the body of the uterus is dilated part, whose upper, dome-shaped, is known as the fundus; its narrower portion which opens into the vagina is called the cervix or cervix. The other end connects to the two fallopian tubes, also known as fallopian tubes.
It has a relatively thick wall and composed of three layers. Externally there is a serous (consisting export usa of mesothelium and connective tissue), or, depending body portion of an adventitia (connective tissue formed by mesothelium without coating). The other two layers are uterine myometrium (thick layer of smooth muscle) and the endometrium (or uterine mucosa).
The myometrium is the thicker wall of the uterus, consisting of smooth muscle fibers of packages separated by connective tissue, export usa divided into four layers not well defined. The first and fourth layer consist essentially longitudinally arranged fibers; the intermediate layers contain export usa the large blood vessels that supply the body.
During pregnancy, the myometrium undergoes a great growth due to hyperplasia and hypertrophy of muscle fibers. During this phase, many of these smooth muscle cells acquire ultrastructural characteristics of secretory proteins and actively cells synthesize collagen, whose amount greatly increases the uterus. After pregnancy, there is degeneration of some smooth muscle cells, reduction in the size and other enzymatic export usa degradation export usa of collagen. The uterus reduces its size to the approximate dimensions as before pregnancy.
The endometrium consists of an epithelium and lamina propria that contains simple tubular glands that sometimes branch in the deeper portions (near the myometrium). The cells lining the uterine cavity are organized in a simple columnar epithelium, composed of ciliated cells and secretory cells. It can be divided into two layers: basal layer: deepest adjacent the myometrium, consisting of connective tissue and the initial portion of the uterine glands. Functional layer: formed by the rest of the connective export usa tissue of the lamina propria, the end portion and mouth glands and also the surface epithelium.
The blood vessels export usa supplying the endometrium is very important for the cyclical export usa phenomenon of loss of the endometrium during menstruation. The arcuate arteries, oriented circumferentially in the middle layers of the endometrium, departing two groups of arteries that supply blood to the endometrium: straight arteries and spiral arteries. export usa
Sources: http://www.todabiologia.com/anatomia/utero.htm http://pt.wikipedia.org/wiki/Útero http://www.agecom.df.gov.br/042/04299003.asp? ttCD_CHAVE = 23163 Basic Histology - Luiz C. Junqueira and Jose Carneiro. Publisher Guanabara Koogan SA (10th Ed), 2004.
Disciplines Arts Astronomy export usa Biology Spanish Humanities Philosophy Physics Geography History English Literature Mathematics Portuguese Chemistry Writing Exercises Online Courses Other issues Administration Curiosities biographies Law Diseases Drugs Economy Education Sports Medicine export usa Languages Mythology Informatics Professions Politics Psychology Society Religion Sexuality Sociology export usa