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OB/GYN Chapter 43
cavity which the fetus exists, forms early in gestation, fills with amniotic fluid to protect the fetus.
surrounds the amniotic cavity, the yolk sac is within the chorionic cavity.
Corpus Luteum Cyst
the small yellow endocrine structure that develops within a ruptured ovarian follicle and secretes progesterone and estrogen.
most accurate measurement of the embryo in the first trimester.
The villi on the maternal side of the placenta or embryo; unites with the chorion to form the placenta.
the villi surrounding the chorionic sac
multiple pregnancy with two amniotic sacs.
Double Decidual sac sign
interface between the decidua capsularis and the echogenicity, highly vascular endometrium
Embryologic age (Conceptual Age)
age calculated from when conception occurs
time between 6 and10 weeks of gestation
Endovaginal (EV) Transducer
high frequency transducer that is inserted into the vaginal canal to obtain better definition of first trimester pregnancy
production and development of blood cells
human chorionic Gonadotropin (HCG)
hormone secreted by the trophoblastic cells (developing placenta cells) of the blastocyst: laboratory test indicates pregnancy when values are elevated.
Menstrual Age (gestational Age)
length of time calculated from the first day of the last normal menstrual period(LMP) to the point at which the pregnancy when values are elevated.
multiple pregnancy with one amniotic sac
multiple pregnancy with one chorionic sac
mean sac diameter
Primary yolk sac
first site of formation of red blood cells that will nourish the embryo
Secondary Yolk Sac
formed at 23 days when the primary yolk sac is pinched off by the extra embryonic coelom
the umbilical duct connecting the yolk sac with the embryo
fertilized ovum resulting from union of male and female gametes
Multiple pregnancy with two chorionic sacs`
multiple pregnancy with one chorionic sac
Formed at 23 days when the primary yolk sac is pinched off by the extra embryonic coelom
secondary Yolk Sac
Age Calculated from when conception occurs
multiple pregnancy with two amniotic sacs
First site of formation of red blood cells that will nourish the embryo
Primary Yolk Sac
Multiple Pregnancy with one amniotic sac
Fertilized ovum resulting from union of male and female gametes.
Length of time calculated from the first day of the last normal menstrual period to the point at which the pregnancy is being assessed
The small yellow endocrine structure that develops within a ruptured ovarian follicle and secretes progesterone and estrogen
Corpus Luteum Cyst
High frequency transducer that is inserted into the vaginal canal to obtain better definition of first trimester pregnancy
The villi surrounding the chorionic sac
Surround the amniotic cavity
Hormone secreted by the Trophoblastic cells of the blastocyst; laboratory test indicates pregnancy when values are elevated
Human Chorionic Gonadotropin
Time between 6 and 12 weeks of gestation
The umbilical duct connecting the yolk sac with the embryo
Most accurate measurement of the embryo in the first trimesteer
Production and development of blood cells
Mean sac Diameter
Interface between the decidua capsularis and the echogenic, highly vascu;ar endometrium
Double Decidual Sac Sign
Cavity in which the fetus exists; forms early in gestation; filld with amniotic fluid to protect the fetus
The villi on the maternal side of the placenta or embryo; unites with the chorion to form the placenta
Clinicals and sonographers use ________ to date the pregnancy, with the first day of the last menstrual Period as the beginning of the gestation.
In the first 9 menstrual weeks, the conceptus is called an
For the time after the first 9 weeks, the embryo is called
The gestational Age (age known as postmenopausal age) is calculated by adding_______ weeks to conceptional age.
The fertilization ovum which should know be referred to as a _____ undergoes rapid cellular division to form the 16-cell morulla.
The blastocyst typically enters the uterus 4 to 5 days after fertilization with implantation occurring ____ days after ovulation.
7 to 9
Although the organ function remains as minimal the ____ system is the first organ to develop rapidly with the first hearbeats between 5.5 to 6 weeks.
Gestational sac size and hCG levels increase ____ until 8 menstrual weeks.
After 8 weeks hCG levels ___ and subsequently decline while the gestational sac continues to grow.
A normal gestational sac can be consistently demonstrated when the hCG level ranges between _____ mIU/ml.
1000 to 2000
The sonographer must be aware that when the hCG level is elevated and the gestational sac is not seen within the uterus a ____ pregnancy should be considered.
The interface between decidua capsularis and the echogenic highly vascularized endometrium forms the ____ sign which has been reported to be a reliable sign of a viable gestation.
Double decidual sac
The gestational sac size grow at a predictable rate of ____ mm per day in early pregnancy.
The first intragestational sac anatomy seen is the sonographic _____ sac which is routinely visualized between 5 and 5.5 wks gestation.
The limb buds are embryologically recognizable during the ____ week of gestation.
The spine is also developing the embryonic period particularly in the ____ weeks of gestation.
5 to 7
The embryonic phase undergoes significant evolution starting in the 5th week of gestation with palate fusion beginning around the ____ week of gestation.
At approximately 10 weeks of gestation the midgut loop continues to grow and rotate before it descends into the fetal abdomen at about the ____ week.
The cystic rhomboid fossa can sonographically be imaged routinely from the _________ week of gestation.
8th to 11th
It is important to note that the ________ ventricles completely fill the cerebral vault at this time in gestation.
Sonographically the gestational sac size or mean sac diameter is determined by the average sum of the _________, _______,and _____ of the gestational sac.
Length, width, height
Failure to visualize the yolk sac, with a minimum of _______ mm MSD, using endovaginal sonography, should provoke suspicion of abnormal pregnancy.
Transabdominal studies have sgown that the yolk sac should be seen within mean sac diameters of ________ mm and should always be visualized with a mean sac diameter of 20mm.
10 to 15
The growth rate of the yolk sac has been reported to be approximately ______ mm per millimeter of growth of the MSD when the MSD is less than 15mm
Using endovaginal sonography, multiple gestation's cab readily be diagnosed at very early stages, between ______ weeks.
5.5 to 6.5