OBS & GYNE Ch. 13 US in First Trimester Flashcards

1
Q

Acrosome

A

area in head of sperm contains enzymes to aid penetration of oocyte

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2
Q

Amnion

A

Membrane enclosing amniotic cavity and embryo/fetus

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3
Q

Aneuploidy

A

Abnormal number of chromosomes

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4
Q

Blastocyst

A

Early gestation made up of trophoblast (outer layer cells), embryoblast (inner cell mass) and fluid filled cavity

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5
Q

Chorion

A

Membrane around chorionic cavity made up of trophoblast cells and extraembryonic mesoderm

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6
Q

Chorionic villi

A

Budlike outward growths from trophoblasts, some give rise to fetal portion of placenta

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7
Q

Conceptual age

A

Duration pregnancy, counted from fertilization (conception), AKA embryonic age or postovulatory age

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8
Q

Conceptus

A

Product of fertilization, including all stages from zygote to fetus

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9
Q

Corpus luteum

A

Progesterone-secreting structure formed by follicle after releasing its oocyte

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10
Q

Crown-rump length (CRL)

A

Measurement longest axis of embryo to determine gestational age

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11
Q

Estimated date of delivery (EDD)

A

Due date, calculated by adding 280 days to first day of LMP, aka estimated date of confinement (EDC)

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12
Q

Decidualization

A

Endometrial changes to allow implantation of blastocyst

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13
Q

Estrogen

A

group of hormones, primarily produced in ovaries, affect secondary sex characteristics and menstrual cycle

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14
Q

Fertilization

A

Penetration of oocyte by sperm to form diploid zygote

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15
Q

Follicle-stimulating hormone (FSH)

A

Hormone produced in anterior pituitary, which stimulates maturation of ovarian follicle

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16
Q

Gamete

A

Haploid cell that, when merged with gamete from opposite sex, creates diploid zygote

17
Q

Gestational age (GA, aka menstrual age)

A

duration of pregnancy, counted from first day of LMP, preg lasts 260 days or 40 weeks

18
Q

First trimester

A

0 days (first day LMP) to end 13th week

19
Q

Second trimester

A

14 weeks to end of 27th week

20
Q

Third trimester

A

28 weeks to delivery

21
Q

Gestational sac

A

First sonographic evidence of intrauterine preg, fluid-filled blastocyst

22
Q

Gravidity

A

Number of times woman has been pregnant

23
Q

Human chorionic gonadotropin (hCG)

A

hormone produced by trophoblasts, extends life of CL in ovary; most preg tests based on this hormone

24
Q

LMP

A

first day of last menstrual period

25
Luteinizing hormone (LH)
Hormone produced by anterior pituitary, triggers ovulation
26
Mean sac diameter (MSD)
Average diameter of GS, used to determine gest age
27
Morula
Solid cluster undifferentiated cells, formed by repeated cleavage of the single cell resulted from fusion of two gametes
28
Nuchal translucency
Subcutaneous fluid in post region of neck of embryo and fetuses up to 14 weeks gest age; abnormally large risk of chromosomal and structural abnormalities
29
Oocyte
female gamete; aka ovum or egg
30
Parity
Summary of a woman's pregnancy outcomes.
31
Pregnancy-associated plasma protein A (PAPP-A)
Protein produced by trophoblasts; abnormal levels may be associated with chromosomal abnormalities
32
Progesterone
Hormone produced by CL and placenta
33
Spermatozoon
male gamete
34
Umbilical vesicle (aka yolk sac)
structure within blastocyst cavity, provides nourishment to embryo and produces its first blood cells, the seconday umbilical vesicle is first structure to be sonographically seen within GS
35
Zygote
single cell resulting from fusion of two gametes