Module 5 Physiology of the 1st trimester Flashcards
Pregnancy is dated how?
By weeks from first day of the last menstrual period or LMP
How long is gestation in weeks?
40 weeks
How long is gestation in days?
280 days
How many trimesters are there for gestation?
Three trimesters
What is the first trimester?
Week 0-12
6/7 weeks long
What is the second trimester?
Week 13-27
6/7 weeks long
What is the third trimester?
Week 28-40
The conceptus is called what?
Embryo
When can we call the embryo a embryo?
from 10 weeks from LMP
What dates do sonography uses?
LMP
What dates does Embryologists use?
Conception dates
After 10 weeks LMP the embryo is called what?
Fetus
In the first trimester what can we do? 5
- Confirm pregnancy
- Confirm location of pregnancy
- Confirm that the size of the embryo agrees with the LMP dating
- Confirm the number of embryos
- Confirm viability
How do we define location of pregnancy?
Intrauterine pregnancy vs uterine pregnancy
What measurement do we use to size the embryo with LMP dating?
CRL- crown rump length
When does ovulation occur?
Day 14 of the ideal cycel
What must happen for ovulation to occur?
LH must surge
Ovum lives for how long?
12 to 24 hours
During ovulation what happens to the ovum?
It is ejected from the follicle and is propelled towards the fallopian tube
Approximately how many sperm cells are deposited near the cervix?
Around 200-500 million
How many sperm reach the ovum?
300-500 sperm
What is the normal sperm count?
100 million sperm/ml
What amount of sperm is considered as sterile males?
20 million or less
How long does sperm live for?
24 hours (some have been known for living up to 72 hours)