CH 47 - 1ST TRIMESTER Flashcards
CLINICIANS AND SONOGRAPHERS USE ______ TO DATE PREGNANCY. WHICH IS THE 1ST DAY OF ___.
GESTATIONAL AGE
LMP
THIS IS USED BY EMBRYOLOGIST USE THIS TO ASSESS GA.
CONCEPTUAL AGE
THE FIRST 4 WKS THE CONCEPTUS IS CALLED __.
ZYGOTE
IN WEEKS 4 -10 THE CONCEPTUS IS CALLED AN _____.
EMBRYO
AFTER 10 WEEKS THE EMBRYO IS CALLED THE ______.
FETUS
WHAT DAY IS A MATURE OVUM RELEASED?
DAY 14
HOW LONG DOES FERTILIZATION OCCUR AFTER OVULATION?
WITHIN 1 - 2 DAYS
THE ___ FOLLICLE COLLAPSES AND BECOMES THE ____ ____ WHICH SECRETES 2 HORMONES; ____ & ___.
GRAAFIAN
CORPUS LUTEUM
PROGESTERONE & ESTROGEN
A FERTILIZED OVUM BECOMES A __ AND RAPIDLY DIVIDES TO FORM THE 16 CELL ___; THEN FORMS THE ______.
ZYGOTE
MORULA
BLASTOCYST
TROPHOBLASTIC CELLS SECRETE _____ _____ ____ AND STIMULATES MATERNAL PREGNANCY RESPONSES.
HUMAN CHORIONIC GONADOTROPIN
TROPHOBLAST FORMS THE ____ ____ (EARLY GESTATIONAL SAC).
PRIMARY VILLI
THE SECONDARY YOLK SAC IS FORMED AROUND ____ DAYS MENSTRUAL AGE.
23
A NML GA SAC CAN BE TRANSABD WHEN THE HCG LEVEL IS ? IT CAN BE SEEN EV AT?
> OR = TO 1800mIU
500 mIU
WHAT mIU/ml LEVEL INDICATES PREGNANCY AND WILL RULE OUT ECTOPIC?
1000-2000
HCG DOUBLES EVERY?
3.5 DAYS
GA SAC SIZE & HCG LEVELS INCREASE PROPORTIONATELY UNTIL ____ WEEKS.
8
DURING THE 5TH WK THE GS GROWS….
1 MM PER DAY IN EARLY PREGNANCY
HOW IS A 5 WK GS POSITIONED IN THE FUNDUS?
ECCENTRICALLY
DURING THE 5TH WEEK WHAT SHOULD BE VISUALIZED?
DOUBLE DECIDUAL SAC SIGN
AT 5 TO 5.5 WKS THE GS SHOULD MEASURE?
> 12MM
WHAT ARE THE FCTNS OF THE SECONDARY YOLK SAC?
- PROVIDE NUTRIENTS
- DEVELOP THE PRIMITIVE GUT
- HEMATOPOISES
HOW IS THE YOLK SAC ATTACHED TO THE EMBRYO?
BYA STALK BETWEEN THE AMNION AND CHORION.
WHEN IS THE YOLK SAC REABSORBED AND NO LONGER SEEN?
AT 12 WEEKS
WHEN DOES ORGANOGENESIS BEGIN?
AT 5 WEEKS.
HOW EARLY CAN HEART MOTION BE DETECTED?
5.5 WEEKS AND CRL AT 3MM
WHAT IS THE TRILAMINAR DISC FOLD AND WHEN DOES THIS OCCUR?
IT IS WHEN THE EMBRYO FOLDS INTO A C SHAPE THAT FORMS THE EMBRYONIC HEAD, CAUDAL PORTIONS, AND LATERAL FOLDS.
STARTS AT 6 WEEKS
THE MIDGUT ELONGATES AND HERNIATES INTO THE BASE OF THE UMBILICAL CORD. WHEN DOES IT RETURN TO THE FETAL ABDOMEN?
10-11 WEEKS
BY ____ WEEKS THE ECHOGENIC BOWEL RETURNS TO THE FETAL ABDOMEN.
12 WEEKS
AT 6 WEEKS THE BRAIN HAS 3 PRIMARY VESICLES. WHAT ARE THEY?
PROSENCEPHALON
MESENCEPHALON
THOMBENCEPHALON
THE RHOMBENCEPHALON FURTHER DIVIDES INTO 2 SEGMENTS:
METENCEPHALON (CEPHALIC PORTION)
MYELENCEPHALON (CAUDAL PORTION)
AT ___ WEEKS THE CHORIOD PLEXAS & FALX IS SEEN.
9
WHEN IS THE MOST ACCURATE GESTATIONAL DATING DETERMINED?
DURING THE 1ST TRIMESTER
WHAT ARE THE 2 PARAMETERS USED FOR GA?
GS SIZE
CRL
HOW DO YOU GET THE MEAN SAC DIAMETER?
L+W+H/3
2 OVA AND 2 SPERM =
DIZGOTIC TWIN (70% OF TWIN PREGNANCIES)
1 OVA AND 1 SPERM =
MONOAMNIOTIC
50% MORTALITY RATE
