Enviado por ” CONSULTORIO MÉDICO FLORES BUISSON ” MÁNCORA- PERÚ

The placenta is an ephemeral organ present in placental vertebrates, such as eutherial mammals and sharks during gestation (pregnancy). The term placenta comes from the Latin for cake, from Greek plakoenta, accusative of plakoeis - πλακοείς, “flat”[1][2], referring to its appearance in humans. Protherial (egg-laying) and metatherial (marsupial) mammals do not produce a placenta. The placenta develops from the same sperm and egg cells that form the fetus, and functions as a foetomaternal organ with two components, the foetal part (Chorion frondosum), and the maternal part (Decidua basalis).
The perfusion of the intervillous spaces of the placenta with maternal blood allows the transfer of nutrients and oxygen from the mother to the fetus and the transfer of waste products and carbon dioxide back from the fetus to the mother.
The uterus (from the Latin word for womb) is a major female reproductive organ of most mammals, including humans. It is within the uterus that the fetus develops during gestation. The term uterus is used exclusively within the medical and related professions; some lay persons use the less formal term, womb. The plural of uterus is uteruses or uteri.
One end, the cervix, opens into the vagina; the other is connected on both sides to the Fallopian tubes.
Pregnancy occurs as the result of the female gamete or oocyte (egg) being penetrated by the male gamete spermatozoon in a process referred to, in medicine, as “fertilization”, or more commonly known as “conception”. The fusion of male and female gametes usually occurs through the act of sexual intercourse. However, the advent of artificial insemination has also made achieving pregnancy possible in such cases where sexual intercourse is not potentially fertile (through choice or male/female infertility).

A number of medical signs are associated with pregnancy.[7][8] These signs typically appear, if at all, within the first few weeks after conception. Although not all of these signs are universally present, nor are all of them diagnostic by themselves, taken together they make a presumptive diagnosis of pregnancy. These signs include the presence of human chorionic gonadotropin (hCG) in the blood and urine, missed menstrual period, implantation bleeding that occurs at implantation of the embryo in the uterus during the third or fourth week after last menstrual period, increased basal body temperature sustained for over two weeks after ovulation, Chadwick’s sign (darkening of the cervix, vagina, and vulva), Goodell’s sign (softening of the vaginal portion of the cervix), Hegar’s sign (softening of the uterus isthmus), and pigmentation of linea alba - Linea nigra, (darkening of the skin in a midline of the abdomen, caused by hyperpigmentation resulting from hormonal changes; it usually appears around the middle of pregnancy).[7][8]

[edit] Duration
The expected date of delivery (EDD) is 40 weeks counting from the last menstrual period (LMP) and usually lasts between 37 and 42 weeks,[9] The actual pregnancy duration is typically 38 weeks after conception. Though pregnancy begins at conception, it is more convenient to date from the first day of a woman’s last menstrual period, or from the date of conception if known. Starting from one of these dates, the expected date of delivery can be calculated. 40 weeks is nine months and six days, which forms the basis of Naegele’s rule for estimating date of delivery. More accurate algorithms which take into account other variables, such as whether this is the first or subsequent child (i.e. mother is a primip or a multip, respectively), ethnicity, parental age, length of menstrual cycle and menstrual regularity form the basis for more sophisticated online calculation methods.

“Jesús le dijo: Yo soy el camino, y la verdad, y la vida; nadie viene al Padre, sino por mí.”
“Jesús said : I am the way, and the truth, and the life; nobody comes to the Father, but for me.”

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