The First Trimester Flashcards
Longest and most tortuous portion of the fallopian tube?
Ampulla – almost most common location for an ectopic
What implants itself into the decidualized endometrium?
Blastocyst
Choriocarcinoma:
Most malignant form of gestational trophoblastic disease
Can metastasize to the lungs, liver and vagina
Chorionic cavity:
space between the chorionic sac and amniotic sac that contains the secondary yolk sac
aka extra-embryonic coelom
Gestational sac aka
chorionic sac
What part of the placental is maternal?
Villi
The endometrial tissue at the implantation site, and the maternal contribution of the placenta?
Decidua basalis
What makes up the double decidual sign?
Decidua parietalis and capsularis
Embryo
Term given to developing fetus before 10wks
Double fold of dura mater:
falx cerebri
Gestational age aka
Menstrual age
Most common form of gestational trophoblastic disease?
Hydatidform mole
Pseudogestational sacs are often seen with:
Ectopic pregnancies – corresponds to an accumulation of blood and secretions within the uterine cavity
What does the rhombencephalon develop into?
Cerebellum, pons, medulla oblongata, and fourth ventricle–hindbrain
What structure is responsible for early nutrient transfer to the embryo?
Secondary yolk sac
This is what’s seen on early pregnancy
Vitelline duct-
Structure that connects the developing embryo to the secondary yolk sac
The outer portion of the blastocyst is the? What does it develop into?
Syncytiotrophoblastic cells
Placenta and chorion
What does the inner portion of the blastocyst develop into?
Amnion, umbilical cord, embryo, and yolk sacs
What is the alimentary canal?
The foregut, mid gut and hindgut
Foregut:
Esophagus, stomahc, liver, GB, panc and prox duodenum
Midgut:
Dst duodenum, jejunum, ilieum, cecum, asc colon, prox half of transverse colon
Hindgut:
Dst half of transverse colon, desc colon, sigmoid colon, rectum and anus
What’s the earliest sign of a pregnancy? First definitive sign?
Double decidual sac sign
Decidual sac
What hCG levels should we see a pregnancy at?
1000-2000 (TV)
GS will grow at a rate of ____ per day
1mm
Where is the secondary yolk sac located?
Chorionic cavity
What produces AFP in early gestation?
Yolk sac
What’s the function of the secondary yolk sac?
Hematopoesis and angiogenesis
