The Role Of Ultrasound In Obstetrics

Front 1

bleeding from a normally situated placenta as a result of its complete or partial detachment after the 20th week.

Back 1

Abruptio placenta

Front 2

Aspiration of a sample of amniotic fluid through the mother's abdomen for diagnostic analysis of fetal genetics, maturity, and/or disease.

Back 2

Amniocentesis

Front 3

smooth membrane enclosing the fetus and the amniotic fluid; it is loosely fused with the outer chorionic membrane except at the placental insertion of the umbilical cord where the amnion is contiguous with the membranes surrounding the umbilical cord.

Back 3

Amnion

Front 4

a neural tube defect where absence of the brain, including the cerebrum, the cerebellum, and basal ganglia, may be present

Back 4

Anencephaly

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the ligatures around the cervix uteri to treat cervical incompetence during pregnancy.

Back 5

Cerclage

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Inferior segment of the uterus, which is normally more than 3.5 cm long during pregnancy, decreasing in length during labor.

Back 6

Cervix

Front 7

Cellular, outermost extraembryonic membrane, composed of trophoblast lined with mesoderm; the outer chorion (villous chorion) develops villi, which are vascularized by allantonic vessels and give rise to the placenta; the inner chorion is fused with the amnion except at the placental cord in

Back 7

Chorion

Front 8

Insertion under sonographic guidance of a thin needle into the vessels of the umbilical cord usually at the site of placental insertion to obtain a fetal blood sample, deliver fetal drug therapy, or assess fetal well-being.

Back 8

Cordocentesis

Front 9

A functional structure within the normal ovary, which is formed from cells lining the graafian follicle after ovulation; the corpus luteum produces estrogen and progesterone and may become enlarged and appear cystic during early pregnancy.

Back 9

Corpus Luteum

Front 10

Vascular structure within the fetal liver that connects the umbilical vein to the inferior vena cava and allows oxygenated blood to bypass the liver and return directly to the heart.

Back 10

Ductus Venous

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Developing individual from implantation to the end of the ninth week gestation.

Back 11

Embryo

Front 12

Length of pregnancy defined in the US a number of weeks from first day of last normal menstrual period.

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Gestational age

Front 13

Structure lined by the chorion that normally implants with the uterine deciduas and contains the developing embryo.

Back 13

Gestational Sac

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age of embryo stated as number of weeks from first day of last normal menstrual period.

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Embryonic Age

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Abnormal conception in which there is partial or complete conversion of the chorionic villi into grapelike vesicles

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Hydatidiform mole

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A condition in which the cervix dilates silently during the second trimester; without intervention, the membranes bulge though the cervix, rupture, and the fetus drops out, resulting in a premature preterm delivery.

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Incompetent cervix

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Reduced growth rate or abnormal growth pattern of the fetus; resulting in a small for gestational age infant

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Intrauterine Growth Restriction

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Thin expanded lower portion of the uterus that forms in the lst trimester or pregnancy.

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Lower uterine segment

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Exceptionally large infant with excessive fat deposition in the subcutaneous tissue; most frequently seen in fetuses of diabetic mothers.

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Macrosomia

Front 20

One of several biochemical tests used to assess fetal rick for aneuploidy or fetal defect; a component of the "triple screen" the normal value of MSAFP varies with gestational age; assessment of gestational age is essential to accurate interpretation of results.

Back 20

Maternal serum alpha-fetoprotein

Front 21

reduced amount of AF

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Oligohydraminos

Front 22

organ of communication where nutrition and products of metabolism are interchanged between the fetal and maternal blood systems; forms the chorion frondosum with a maternal decidual contribution

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Placenta

Front 23

Placental implantation encroaches upon the lower uterine segment; if the placenta presents first in late pregnancy, bleeding is inevitable

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Placenta Previa

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Excessive amount of amniotic fluid

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Polyhydramnois

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a 40 weeks is divided into three 13 weeks periods from the first day of the last normal menstrual period ( weeks 1 through 12, first day of the normal

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Trimester

Front 26

connecting lifeline between the fetus and placenta; it contains two umbilical arteries, which carry deoxygenated fetal blood, and one umbilical vein, which carries oxygenated fetal blood encased in Wharton's jelly.

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Umbilical cord

Front 27

a circular structure within the gestational sac seen sonographically between 4 and 10 weeks gestational age; the yollk sac supplies nutrition, facilitates waste removal, and is origin of early hematopoietic stem cells in the embryo; it lies between the chorion and the amnion.

Back 27

Yolk Sac

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Products of conception from fertilization through implantation; the zygotic stage of pregnancy last for approximately 12 days after conception.

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Zygote