Labour Flashcards
When does Fertilization occur
12-24 hrs after ovulation
Formation of the blastocyst ( trophoblast and inner cell mass) time
3-5 days after fertilization’s
Implantation time
5-7 days after fertilization
When does the chorion begin to produce hCG
First 3 months of pregnancy
When does gastrulation occur ( the formation of the three germ layers)
Week 1-3
When is the embryonic development period
Week 3-8
When is the beginning of fetal development
Week 9
When is the beginning of the 2nd trimester
Month 4
What happens during the 2nd trimester
The placenta takes over estrogen and progesterone production
When is the beginning of the third trimester
Month 7
What happens during the third trimester
Increased relaxin softens the cervix and loosens ligements
When does lactation occur
After labour
Teratogen
Substances that cause structural abnormality due to exposure during pregnancy
Neurulation
Building of the nervous system
Zygote
A joined ovum and sperm
Acrosomes
Enzymes that allow sperm to move through egg layers
Cleavage
Process of cell division without enlarging cells
Morula
Fills with fluid from uterus and develops into the blastocyst
Blastocyst
Becomes embryo after gastrulation
Made up of two parts
Trophoblast blast and inner cell mass
Trophoblast
Outside part of blastocyst
Inner cell mass
Fluid inner part of blastocysts
Chorion
Develops into the placenta
Amnion
Develops into the amniotic sac
Trophoblast secretes
hCG
What is the hormone identified on pregnancy tests
HCG
What does HCG do
Maintains corpus luteum
Gastrulation
Formation of the three germ layers
