FINAL: Unit 4: Fetal Development+Congenital Heart Defects Flashcards
(113 cards)
This system in terms of embryologic development
DEVELOPS EARLY
CARDIAC SYSTEM
Cardiac System
Embryologic Development
DAY 22 to 23
Fusion of the endocardial heart tubes
*THE HEART BEATS*
CARDIAC SYSTEM
Embryologic Dev
DAY 27
Heart starts circulating blood from the heart to the rest of the embryo
CARDIAC SYSTEM
Embryologic Dev
WEEK 8
4 Chambers of heart FULLY DEVELOPED
==> NORM heart function
CARDIAC SYSTEM
embryologic Dev.
WEEK 12***
Circulatory System is OPERATING
*NOTE: 12 weeks CARDIAC progress is 28-38wks progress for LUNGS
CARDIAC SYSTEM
Embryological Dev.
1st-2nd Trimester
HEART CAN FUNCTION
This system in terms of Embryologic Dev.
DEVELOPS LATE
PULMONARY SYSTEM
PULMONARY SYSTEM
Embryologic Dev.
WEEK 24*
Mucosal glands functional
Surfactant begins production (so the lungs can work—INC surf area)
PULMONARY SYSTEM
Embryologic Dev.
WEEK 28 TO TERM:
Surfactant production MATURES
PULMONARY SYSTEM
Embryologic Dev.
WEEK 36-40***
Alveoli appear, and surfactant reaches FULL MATURITY and is FUNCTIONAL
**REMEMBER—heart is fully working WAY BEFORE THIS (week 8 and by week 12 circulatory system is FULLY WORKING)
Fetal circulation is ________ from post-natal circulation
DIFFERENT
Fetal Circulation
Placenta
*Umbilical cord connects the placenta TO IVC and contains___________
Contains umbilical artery and umbilical vein
- Umbilical artery brings De-O2’d blood OUT of body
Fetal Circulation
Blood from the IVC goes where?
IVC—-> Rt. Atrium
*O2 comes from placenta
Fetal Circulation
Foramen Ovale
- permits MOST OF (90%) oxygenated blood ENTERING R. ATRIUM to pass INTO L. Atrium
- **SKIPS R. VENTRICLE + LUNGS
Fetal Circulation
Ductus Arteriosus
- Connects Aorta w/ the Pulm aa
-
SHUNTS most blood AWAY from lungs INTO aorta
- SKIPS LUNGS + L. SIDE OF HEART
- R. atrium–> R. vent–pulm aa–> aorta
Fetal Circulation
10% of blood goes where
10% goes to LUNGS only to nourish the developing lung tissue
BOTH Foramen Ovale and Ductus Arteriosus
Allow what?
- Allow blood to skip or shunt R. ventricle
OR
- Skip or shunt Lungs and L. side of heart
Fetal Circulation
More on blood vessels of Pulmonary circulation
*remember LUNGS for most part (only 10%) are SKIPPED
- Vessels of pulm circulation are vasoconstricted in the fetus
- blood traveling to and thru lungs is primarily used to nourish and develop lung tissue
Ductus Arteriosus
Blood b/w _______ and ________
Pulm aa & Aorta
Foramen Ovale
Blood b/w _________ and ________
R. and L. Atria
Umbilical Vein
O2’d blood into WHERE?
O2’d blood INTO IVC
**O2’d blood FROM PLACENTA
MORE PICS ON
O2’d blood from Placenta
Foramen Ovale–blood from Rt. atrium to L. atrium
Ductus Ateriosus–shunts blood AWAY from lungs
see pics
Fetal Circulation
Blood travels BACK TO PLACENTA via____________
Umbilical Arteries
*remember this is de-O2’d blood
Pediatric Development
Neonatal
Fetal fluid in lungs is squeezed out while passing thru birth canal.
Remaining fluid is Absorbed by capillaries and lymph
So that WHAT HAPPENS???
So infants lungs can expand w/ air w/ their first breath
-
Surfactant is necessary to maintain patent alveoli
- PREVENTS COLLAPSE***