L7 Human embryology and developmental biology

6 important questions on L7 Human embryology and developmental biology

Name twi organ systems that are unlikr the rest nog fully developed after the 8th week (so after the embryonic period) :

The lungs
The urinary tract/system

Cleavage and blastulation process
In what order does this happen?

2-cell stage
4-cell stage
8-cell stage
morula -> 16
early blastocyst
late blastocyst

Which cells are forming the outer layer of the blastocyst and provide nutrients and form large part of the placenta?

How is the thick transparent membrane that surrounds the ovum (in mammal) before implantation called?

Trophoblasts
Zona pellucida
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Week 2: bilaminar embryo and fully implantation

Some differentiation of the cytotrophoblast:
Cytotrophoblast is made up of:
- amnioblasts
- lining 1ste yolksac
- extra-embryonic mesoderm

Placentation: trophoblast formation & gastrulation

The inner cell mass subdivides into the upper epiblast and lower hypoblast.

Formation of extra embryonic mesoderm and secondary yolk sac.

Which component is responsible for the formation of the extra embryonic mesoderm?

Cytotrophoblast

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