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The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.
The first trimester begins with the start of gestational age as described above, that is, the beginning of week 1, or 0 weeks + 0 days of gestational age (GA). It ends at week 12 (11 weeks + 6 days of GA) [ 4 ] or end of week 14 (13 weeks + 6 days of GA).
In the first trimester, a standard ultrasound examination typically includes: [12] Gestational sac size, location, and number; Identification of the embryo and/or yolk sac; Measurement of fetal length (known as the crown-rump length) Fetal number, including number of amnionic sacs and chorionic sacs for multiple gestations; Embryonic/fetal ...
Fetal warfarin syndrome is a disorder of the embryo which occurs in a child whose mother took the medication warfarin (brand name: Coumadin) during pregnancy.Resulting abnormalities include low birth weight, slower growth, intellectual disability, deafness, small head size, and malformed bones, cartilage, and joints.
Throughout the entire first trimester, doctors were cautiously optimistic that the baby was developing at a normal rate, but after my history with the miscarriages, I was pessimistic.
Lung bud, the first traits of the lung appear. [1] Hepatic plate, the first traits of the liver appear. [1] Buccopharyngeal membrane ruptures. This is the future mouth. [1] Cystic diverticulum, which will become the gallbladder, and dorsal pancreatic bud, which will become the pancreas appear. [1] Urorectal septum begins to form.
Device for obstetric ultrasonography including usage in 1st trimester. Transvaginal ultrasonography of an embryo at 5 weeks and 5 days of gestational age, with discernible cardiac activity (arrow). In the first trimester, cardiac activity can be visualized and the fetal heart motion quantified by obstetric ultrasonography.
The embryonic stage covers the first eight weeks of development; at the beginning of the ninth week the embryo is termed a fetus. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days. [2]
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