Term
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Definition
| cavity in which the fetus exists; closed sac between the embryo and the amnion, containing the amniotic fluid |
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Term
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Definition
| Surrounds the amniotic cavity; the yolk sac is within the cavity |
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Term
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Definition
| The small yellow endocrine structure that develops within a ruptured ovarian follicle and secretes progesterone and estrogen |
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Term
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Definition
| Most accurate measurement of the embryo in the first trimester |
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Term
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Definition
| The villi on the maternal side of the placenta or embryo; unites with the chorion to form the placenta |
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Term
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Definition
| The villi surrounding the chorionoic sac |
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Term
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Definition
| Exhibiting two amniotic sacs |
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Term
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Definition
| Multiple pregnancy with two chorionic sacs |
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Term
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Definition
| Interface between the decuda capsularis and the echogenic, highly vascular endometrium |
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Term
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Definition
| conceptual age is also known as ? |
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Term
| embryonic age/conceptual age |
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Definition
| age calculated from when conception occurs |
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Term
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Definition
| Tme btw 6 and 10 weeks of gestation |
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Term
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Definition
| high frequency transducer that is inserted into the vaginal canal to obtain better definition on first trimester pregnancy |
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Term
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Definition
| Production and dev’t of blood cells |
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Term
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Definition
| Hormone secreted by the trophoblastic cells (dev’ping placental cells) of the blastocyte; Elevated lab test indicates pregnancy |
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Term
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Definition
| Pregnancy occurring within the uterus |
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Term
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Definition
| gestational age is also referred to as ? |
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Term
| menstrual age (gestational age) |
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Definition
| calculated by adding 2 weeks (14 days) to embryologic age; refers to length of time calculated from the first day of the last normal menstrual period (LMP) to the point at which the pregnancy is being assessed |
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Term
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Definition
| Multiple pregnancy with one amniotic sac |
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Term
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Definition
| Multiple pregnancy with one chorionic sac |
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Term
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Definition
| sonographic measurement of the gestational sac; Mean sac diameter |
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Term
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Definition
| first site of formation of red blood cells that will nourish the embryo |
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Term
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Definition
| Formed at 23 days when the primary yolk sac is pinched off by the extra embryonic coelom |
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Term
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Definition
| The umbilical duct connecting the yolk sac with the embryo |
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Term
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Definition
| Fertilized ovum resulting from union of male and female gamete |
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Term
| gestational age, conceptual age |
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Definition
| ? would add 2 weeks to the ? |
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Term
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Definition
| the first 9 weeks the conceptus is called ? |
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Term
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Definition
| after the first 9 weeks the conceptus is called ? |
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Term
| distal end of FT; 1-2 days |
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Definition
| ovum is swept into the distal FT and fertilization occurs where ? and how many days after ovulation |
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Term
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Definition
| follicle that released the mature ovum hemorrhages and collapses to form the ? |
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Term
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Definition
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Term
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Definition
| when is the primary yolk sac pinched off and becomes the secondary yolk sac |
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Term
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Definition
| during this phase all major internal and external structures begin to dev'p |
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Term
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Definition
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Term
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Definition
| embryo changes from flat, disc-like configuration to a C-shaped structure |
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Term
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Definition
| how long should the fetus be by the end of the 10th week |
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Term
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Definition
| What part of the 1st trimester is the beginning of the fetal period |
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Term
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Definition
| the gestational sac and hCG increase proportionally until ? weeks; and the MSD is ?mm |
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Term
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Definition
transabdominally, a normal gestational sac can be demonstarted wihen the hCG level is ?
Endovaginally, hCG levels are around ? |
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Term
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Definition
| what is the hCG level that indicates a normal pregnancy |
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Term
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Definition
| what should be considered if the hCG level is elevated and the gestational sac is not seen within the uterus |
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Term
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Definition
| ? will likely decrease after 1st trimester when the placenta takes over |
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Term
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Definition
| failure for the levels of hCG to double every ffew days indicates ? |
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Term
| 1-2 mm sac with an echogenic ring having a sonolucent center |
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Definition
| what does an IUP look like at 5 weeks |
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Term
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Definition
| what does the anechoic center of the gestational sac represent at 5 week |
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Term
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Definition
| what does the echogenic ring with an IUP represent |
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Term
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Definition
| gestational sac size grows at what rate in early pregnancy |
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Term
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Definition
| what is the first intragestation sac seen |
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Term
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Definition
| is the gestational sac seen before the heart beat? |
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Term
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Definition
| the yolk sac is attached to the embryo by ? |
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Term
| amniotic and chorionic cavity |
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Definition
| the yolk sac lies between what two structures? |
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Term
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Definition
| when does the yolk sac detach from the yolk stalk? |
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Term
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Definition
| beginning of the ? week, the bilaminary embryoinic disk is converted into the trilaminar embryonic disc |
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Term
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Definition
| at 5.5 weeks, how big is the CRL |
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Term
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Definition
| chorioamniotic fusion occurs |
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Term
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Definition
| the limb buds are recognized by ? week |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| primitive neural tube closes at ? weeks |
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Term
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Definition
| the skeletal system starts to dev't when ? |
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Term
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Definition
| what is the first part of the skeletal system to dev'p, what comes next |
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Term
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Definition
| the hands and feet are completely dev'pd by what week? |
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Term
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Definition
| the fingers and toes are completely dev'td by what week |
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Term
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Definition
| palate fusion begins when |
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Term
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Definition
| when are the maxilla and mandible visualized? |
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Term
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Definition
| the anterior abdominal wall is dev'ped by |
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Term
| dorsal yolk sac into the embryo |
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Definition
| the primitive gut is formed by the incorporation of the ? into the ? |
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Term
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Definition
| when does the midgut descend into the fetal abdomen |
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Term
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Definition
| when is the echogenic umbilical cord mass no longer visualized |
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Term
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Definition
| 3 primary brain vesicles dev'p |
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Term
| prosencephalon, mesencephalon, rhombencephalon |
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Definition
| what are the three brain vesicles |
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Term
cephalic = metencephalon
caudal = myelencephalon |
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Definition
| what are the two branches of the rhombencephalon |
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Term
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Definition
| cerebellum, medulla, and medulla oblongata enclose the ? to form the 4th ventricle |
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Term
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Definition
| cerebral hemisphere seen around ? weeks |
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Term
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Definition
| what does the choroid plexus look like on ultrasound |
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Term
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Definition
| the choroid plexus fills the ? |
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Term
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Definition
| ? surrounds the choroid plexus |
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Term
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Definition
| what is the normal rhythm of the embryonic heart beat during the first trimester |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| average sum of the length, width, and height of the gestational sac |
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Term
Menstrual age days
Menstrual age weeks |
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Definition
MSD (mm) + 30 =
MSD (mm) +30 / 7 = |
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Term
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Definition
| the normal yolk sac should never exceed |
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Term
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Definition
| CRL may be used up to ? weeks of gestation |
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Term
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Definition
| twin gestations have a ?x greater mortality rate than singles |
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Term
| two ova; dichorionic and diamniotic |
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Definition
| dizigotic (? ?) twin pregnancies comprise 70% of all twins = di di means ? |
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Term
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Definition
| di di twins have ? gestational sacs |
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Term
| twins apear to be contained within one chorionic sac; two amnions, two yolk sacs, and two embryos |
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Definition
| monochorionic-diamniotic means ? |
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Term
| one gestational sac with one amniotic membrane, 1-2 yolk sacs, 2 embryos within 1 amniotic membrane |
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Definition
| mono-mono is defined as ? |
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Term
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Definition
| what is the mortality rate for mono-mono twins |
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Term
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Definition
| as the zygote descends down the FT, what is it called 2-3 days after ovulation ? |
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Term
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Definition
| the blastocyte enters the uterus ?-? days after fertilization, with implantation occurring ?-? days after ovulation |
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Term
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Definition
| the wall of the gestational sac is ? |
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Term
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Definition
| yolk sac seen when gestational sac is larger than ?mm and an embryo is seen when the gestational sac is larger than ?mm |
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Term
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Definition
| Embryologists use ?, also known as embryologic age, to assess gestational age, with conception as the first day of the pregnancy |
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Term
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Definition
| Clinicians and sonographers use ?, also known as menstrual age, to date the pregnancy, with the first day of the last menstrual period as the beginning of gestation |
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Term
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Definition
| Further cell proliferation brings the morula to the ? stage, which contains trophoblastic cells and the “inner cell mass,” which forms the ? |
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Term
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Definition
Nutrients, blood cell production, and development of the embryonic endoderm
are essential functions of ? |
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Term
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Definition
| The ?, derived from the primitive gut, develops and forms the majority of the small bowel, cecum, ascending colon, and proximal transverse colon. |
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Term
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Definition
| Recent data suggest that normally the echogenic umbilical cord mass should not exceed ? mm at any gestational age and never measure less than ? mm |
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