Foetal development Flashcards
Ectoderm
Outside
skin, hair, fingernails
Mesoderm
Muscles/ blood/ skeletal system kidneys (between)
Endoderm
Gut (outside)
Gastrulation generates?
3 Germ layers
Fertilisation pathway (sperm)
Corona radiata,
Zona pellucida
Plasma membrane if second oocyte
Cytoplasm of secondary oocyte
Describe clevage to blastocysts journey
D1: Zygote two cell stage
D2: clevage of zygote-4 cell stage
Morula day3-4
Blastocyst day 5
Describe the structure of a blastocysts
Trophoblasts outer cells
Blastocyst hollow cavity
Embryoblasts inner mass- Within the trophoblasts
Describe the pathway of fertilisation- implatation
- Fertilization: fallopian tube
- Cleavage:
- Morula:
Uterus cavity
- Blastocyst-
- Implatation
What is the connection between a child and mother
Chorionic villi- fetal placenta
Describe process of trophoblast to bilaminar embryonic disc
Syncytio T-blast allows burrowing in ENometrium
Cyto T-blasts- are the outside trophoblasts when implanantation
DISK FORMS
Bilaminar disk
- hypoblasts and EPiblasts
- OCCURS DURing half of implantation
Describe the development of the Amnion cavity and the yolk sac
- Implantation into endometrium is complete
Bilaminar disk turns into yolk sac and amnion cavity
Hypoblasts- yolk sac
Epiblasts- amnion cavity
Describe Gasturlation
Primitives streaks forms within the amnion cavity
Primitive streak allows the 3 germ layers to be produced
Ectoderm
Mesoderm
Endoderm
Describe the Notochordal process
Primitive streak has occurred
Notochordal process is what occurs when a connection or “pathway” has developed between the amino cavity and the yolk sac.
What is the Neural Plate
Neural plate is described as the plate on top of the Amnion cavity
what do somite’s form
ribs, skeleton muscles of neck and back
