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Second week of intrauterine life
4/29/2018 1
Learning objectives
• Enlist the events of 2nd week of development
• Define ectopic pregnancy
• Enumerate the different sites of ectopic
pregnancy
4/29/2018 2
4/29/2018 3
Bilaminar embryonic disc
• Epiblast
• Hypoblast
4/29/2018 4
4/29/2018 5
Trophoblast
• Cytotrophoblast
• Syncytiotrophoblast
4/29/2018 6
hCG
• Syncytiotrophoblast produces this hormone
4/29/2018 7
Amniotic cavity
• A small cavity in the embryoblast
• Amnioblasts- amnion forming cells
• Amnion- thin membrane enclosing amniotic
cavity
4/29/2018 8
Exocoelomic cavity
• Exocoelomic membrane
• It lines the inner surface of the cytotrophoblast
• Membrane and cavity modify to form the
primary umbilical vesicle
4/29/2018 9
4/29/2018 10
4/29/2018 11
Extraembryonic mesoderm
• The outer layer of the cells from the umbilical
vesicle endoderm form a layer of loosely
arranged CT, the extraembryonic mesoderm,
which surrounds the amnion and the umbilical
vesicle (yolk sac)
4/29/2018 12
Lacunae
• Isolated cavities appear in the syncytiotrophoblast-
the lacunae
• Fluid in the lacunae called embryotroph
• Passes to the embryonic disc by diffusion
4/29/2018 13
4/29/2018 14
Uteroplacental circulation
• Communication of the eroded uterine vessels
with the lacunae
4/29/2018 15
Extraembryonic coelom
• As changes occur in the trophoblast and the
endometrium the extraembryonic mesoderm
increases and isolated extraembryonic
coelomic spaces appear within it
• These spaces rapidly fuse to form a large,
isolated cavity, the extraembryonic coelom
• Fluid filled cavity
4/29/2018 16
Connecting stalk
• Implanted embryo is attached to the chorion
by connecting stalk
4/29/2018 17
4/29/2018 18
4/29/2018 19
Secondary umbilical vesicle
• It may have a role in the transfer of nutritive
materials to the embryonic disc
4/29/2018 20
Development of the chorionic sac
• Extraembryonic somatic mesoderm and the
two layers of trophoblast form the chorion
• The embryo and its amniotic sac and umbilical
vesicle are suspended in the chorionic cavity
by the connecting stalk
4/29/2018 21
4/29/2018 22
4/29/2018 23

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2nd wk