Placenta, Umbilical Cord, Amniotic Fluid: 3 DONE Flashcards
Discuss aspects of amniotic fluid including source, volume, and functions
Produced by?
how much ml at term?
Produced by fetal kidneys & lungs at 10 weeks (exam question)
At term, approximately 1000mL
Amniotic fluid functions
MAC IPA
KNOW THIS!!!
Maintains constant temperature
Allows movement and development
of fetal limbs
Cushions fetus
Important to fetal lung development
Provide vitamins, proteins, IgG, electrolytes
Antibacterial properties
Describe the structure and function of the placenta
Derived from? how many layers?
what happens in Intervillous spaces?
Functions of placenta? KNOW THIS
Derived from the trophoblast cells of the blastocyst, has 2 layers
Intervillous spaces (exam question)
* Maternal blood provides oxygen and nutrients
* Exchanges waste and carbon dioxide from the fetus
Functions: (exam question
* Endocrine
* Immune barrier (semipermeable membrane)
Other facts about placenta
Until week 16?
Remainder of pregnancy?
What influences thickness of placenta?
How many ml of blood at term?
Until week 16 the placenta grows in thickness and circumference
- Remainder of pregnancy only grows in circumference
- Viral infections can influence thickness of placenta (thinner)
- Contains approx. 500mL of blood at term
Know This!!!
Maternal side of placenta?
color?
Fetal side of placenta?
Weighs?
Maternal side is rough and convoluted
Dull red in color due to maternal blood
Fetal side is shiny and smooth*
Weighs about 1lb at term
Describe the umbilical cord structure and function. KNOW THIS!!!!
How many vessels?
How many arteries? what do they do?
How many veins? What do they do?
Covered with?
Attached to?
Develops from?
3 vessels (AVA) (exam question)
2 arteries – return blood to the placenta/chorionic villi (away from baby)
1 vein – carries nutrient and oxygen rich blood from mom to the baby (CRUCIAL!!!)
- Covered with Wharton’s jelly (exam question)
- Centrally attached to the placenta
- Develops from the connecting stalk
