Session 2 - Embryology Flashcards
Explain the process of fertilisation
- Oocyte released from ovary and travels along fallopian (uterine) tube
- fertilised by sperm in ampulla
- fertilised oocyte called zygote
Ideal site for implantation is the posterior uterine wall
What do you call a fertilised oocyte?
The zygote
What’s the ideal site for implantation?
Posterior uterine wall
How long is an oocyte and sperm viable for?
Oocyte - 1 day
Sperm - up to 3 days
How many days after fertilisation does implantation occur
6/7 days (a week)
Fertilisation of the Oocyte in the ampulla usually occurs around how many hours after Oocyte release
12-24 hrs
What two things does implantation establish
- establishes maternal blood flow within the placenta
- establishes the basic structural unit of maternal fetal exchange ( the chorionic villus)
What part of the blastocyst implants and embeds into endometrium?
Syncytiotrophoblast makes contact with glands and tissues of the endometrium
What conditions are linked to implantation defects?
IUGR (intrauterine growth restriction), pre-eclampsia, ectopic pregnancy, placenta praevia
What do The inner and outer cell masses eventually form?
Epiblast and hypoblast before germ disc
Outer cell masses form into…
Synctiotrophoblast and Cytotrophoblast before placental membranes
Outline the key events and processes in early development?
- Fertilisation and implantation
- Gastrulation
- Neurulation
- Segmentation
- Folding 
