Physiology Flashcards
(29 cards)
What is the viability of oocyte and sperm?
oocyte: 24hrs after ovulation
sperm: 72hrs after ejactulation
What is the corticol rxn?
prevents other sperms from getting into the egg
Where does fertilization occur?
fallopian tube
What are the stages of the sperm and egg meeting?
zygote (fertilized egg) –> cell division –> morula (mass of cells) –> blastocytes
What is the trophoblast?
helps build the placent
adheres to the endometrium
What is the inner cell mass?
embryo
invades the endometrium
What happens if implantation happens in the lower uterine segment (internal OS)?
painless vaginal bleeding
What makes up the placenta?
embryonic + maternal tissues
What is the chorion?
extraembryonic mesoderm + trophoblast
Should the mom and fetal blood mix? What prevents?
NO
lacunea
How many vessels are in the placenta?
3
1 umbilical vain
2 arteries
What are True Knots?
knotting b/c there is too much twisting of the vessles
What is Nuchal Cord?
cord goes around the neck of the fetus
What is used by the placenta - energy?
70% glucose
What happens at 3wk?
CNS begin to develop/heart development initiated
What happens at 4wk?
outpouching from the anterior brain (eyes, arms, legs) develop
What haps at 5wk?
brain develops into 5 componenets
What haps at 6wk?
major organs develop
testosterone produced by tests - boy changes; girls dont
What haps at 12th wk?
able to hear the heart w/ doppler
What haps at 16th?
able to tell male or female
meconium formation in intestines
What haps 14-16th wk?
brain development to suck/swallow
What haps 20th wk?
languo - hair all over the body
vernix caseosa - sebaceous secretion + antimicrobial
At what wk should the baby be able to survive outside uterus if lungs are capable of breathing?
28 wks
What haps at 32nd wk?
head turns down
