Antepartum/Maternal Flashcards
DEFINE:
- Fusion of ovum and sperm
- In fallopian tubes.
FERTILIZATION
When does FERTILIZATION occur.
Occurs around 2 wks. after last normal menstrual period in a 28-day cycle.
DEFINE:
Occur about 7-10 Days after conception.
IMPLANTATION
What happens during IMPLANTATION?
Fertilized egg attaches to endometrium.
DEFINE:
- When fertilized egg cell divides MANY TIMES to produce specialized cells.
CELL DIFFERENTIATION
Pregnant period time.
- 40 weeks
- 90 months
- 266-280 days
Name the THREE stages of FETAL DEVELOPMENT.
- Pre-embryonic stage
- Embryonic stage
- Fetal Stage
Pre-embryonic stage INCLUDES 2 stages of the human development.
1.
2.
- Zygotic stage
- Blastocyst stage
define:
fertilization of sperm & egg through second week.
Zygote stage
define:
Zygote divides IN ball of cells then attaches to uterus
Blastocyst stage
Stage after Blastocyst.
Embryonic stage
Embryonic stage lasts ____ weeks.
3-8 weeks.
Stage AFTER EMBRYONIC stage
FETAL STAGE
FETAL STAGE LASTS
9 weeks till Birth
The babies SEX is determined by which parents dna?
FATHER.
Begins day 15 post conception - week 8
Embryonic stage.
The Embryonic membranes are
1.
2.
- Amnion-Inner layer
- Chorion-Outer layer
What is the job of the EMBRYONIC MEMBRANES?
surround and protect embryo (future baby)
Embryonic membrane that:
- contains amniotic fluid
- From ectoderm germ layer
- WIth time it expands and touches Chorion
Amnion-Inner Layer
Embryonic membrane that:
1. has fingelike projections “chorionic villi”
2. From trophoblast cells and mesodermal lining.
Chorion-Outer Layer.
These two fetal membranes form
fluid-filled amniotic sac, or bag of waters (BOW)
What happens if the embryonic membranes has ruptured for a long time?
INFECTION.
Becomes chorioamnionitis
Which of the Fetal Development Stages is MORE SUSCEPTIBLE TO TERATOGENS?
Embryonic Stage
What are TERATOGENS
- A teratogen is a substance that **interferes with normal fetal development and causes congenital disabilities. **
- Drugs, alcohol, chemicals and toxic substances are examples of teratogens.
- Teratogens can also increase the risk for miscarriage, preterm labor or stillbirth.
What week of the embryonic development will show HEARTBEAT- REGULAR RHYTHM?
Week 5
What week of the embryonic development will begin formation of LUNGS.
week 6
What week of embryonic development can the fetal heartbeat be HEARD?
WEEK 7
What week of the embryonic develpment will the embryo resemble a human being?
Week 8
Once it becomes human looking its called a fetus.
Which stage is this:
- From 9th week until birth
- Longest period of dev.
FETAL STAGE
IN the fetal stage the embryo is now called
FETUS
What does the fetus have/show during the fetal stage?
- All major organ systems in BASIC form
- Dramatic growth & refinement
Week where Gender can be determined
Week 12
Weeks 9-12 the fetus has
- 20 temporary teeth
- Urine produced & excreted
What is happening in weeks 13-16
- lanugo (hair around body
- Fetus MOVES (Quickening)
- Sucking & Swallow
- Nails present
What is happening in weeks 17-20
- Rapid brain growth
- FHR with stethoscope
- Vernix caseosa: white, creamy, naturally occurring biofilm covering the skin of the fetus during the last trimester of pregnancy
What happens in WEEKS 21-24
- Hand grasp & startle reflex
- Alveoli formation & surfactant - LUNGS
What week will show:
- Eyelids open & close
- Fingerprints are set
week 25-28
Weeks where LUNGS are NOT fully mature.
weeks 29-32
Weeks where:
- Testes descend
- transport of antibodies from MOM -> FETUS occur
- Weeks 33-38
- Considered **FULL TERM **now.
What organ provides FETAL oxygenation?
placentA
in FETAL CIRCULATION are the lungs involved?
No- fetus lungs are NOT FUNCTIONAL.
Explain fetal circulation in basic terms
PLACENTA —> FETUS —> PLACENTA
Does the fetus perform any metabolic functions?
NO.
Mothers body performs these functions.
In fetal circulation there are small passages that direct blood that needs to be OXYGENATED.
what are these passages called?
Shunts.
WHat are the 3 SHUNTS in fetal circulation?
- Ductus Venosus
- Ductus Arteriosus BYPASSES L. Lungs
- Foramen Ovale BYPASSES L. Ventricle & Lungs
Which sHUNT bypasses LIVER
DUCTUS VENOSUS
THINK: VENOUS DELIVERY FROM PLACENTA
WHICH SUNT bypass L. LUNGS
DUCTUS ARTERIOSUS
THINK: DEOXYGENATED BLOOD CARRIED AWAY
WHICH SHUNT BYPASSES Right VENTRICLE AND LUNGS.
FORAMEN OVALE
** THINK OPENING (OVALE)**
MAIN function of fetal shunts
Ensures oxygenated blood is received in heart and brain.
So, during fetal stage oxygen is received via ______.
After birth, oxygen is received via _______.
- placenta
- lungs.
Circulatory Changes AT BIRTH
- shunts no longer needed
- Newborn takes 1st breath
- Clamping of cord changes circulation.
- circulation and blood flow functions like an adult.
What is FUNCTIONAL MURMUR
Delay shunt closure can be benign or innocent (no damages)
Define:
- Surrounds EMBRYO for protection.
- embryo swallows and voids in this fluid.
- Includes Maternal BLOOD also.
- Formed by the amnion (inner layer) and chorion (outer layer) membranes
Amniotic fluid
How much amnioitic fluid is accumulated in a FULL TERM?
1 Liter
Whats in the amniotic fluid?
98% water
2% organic matter
Functions of the Amniotic fluid include:
- Thermoregulation for fetus
- Permit symmetric growth & development
- Cushion fetus from trauma
- prevents umbilical cord from compression
- Promote fetal movement
too little amniotic fluid
<500 mL at TERM is called
oligohydramnios
oligohydramnios is associated with
- Renal abnormalities
- Risk of surgical births
- Low-birth-weight infants
Too much amniotic fluid
<2000 mL at term.
Hydramnios
Hydramnios is associated with
- Maternal DM
- Neural tube defects
- Chromosomal deviations
- Malformations of CNS &/or GI tract
- May CAUSE premature rupture of membrans related to over distention
AMniotic fluid that is
Colorless with slight to moderate turbidity
normal
amniotic fluid that is bLOOD-STREAKED
trauma tap, abdominal trauma, intra-amniotic hemorrage