gejegor wallpapers: New 3d ultrasound pictures of twins

Friday, 15 April 2011

New 3d ultrasound pictures of twins

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One scientific term for the state of pregnancy is gravidity (adjective "gravid"), and a pregnant female is sometimes referred to as a gravida. Neither word is used in common speech. Similarly, the term "parity" (abbreviated as "para") is used for the number of previous successful live births. Medically, a woman who has never been pregnant is referred to as a "nulligravida", a woman who is (or has been only) pregnant for the first time as a "primigravida", and a woman in subsequent pregnancies as a multigravida or "multiparous". Hence, during a second pregnancy a woman would be described as "gravida 2, para 1" and upon live delivery as "gravida 2, para 2". An in-progress pregnancy, as well as abortions, miscarriages, or stillbirths account for parity values being less than the gravida number. In the case of twins, triplets etc., gravida number and partiy value are increased by one only. Women who have never carried a pregnancy achieving more than 20 weeks of gestation age are referred to as "nulliparous".

The term embryo is used to describe the developing offspring during the first 8 weeks following conception, and the term fetus is used from about 2 months of development until birth.

The process of fertilization occurs in several steps, and the interruption of any of them can lead to failure. Through fertilization, the egg is activated to begin its developmental program, and the haploid nuclei of the two gametes come together to form the genome of a new diploid organism

Legal regulations in different countries include gestation age beginning from 16 to 22 weeks (5 months) before birth.