embryology Flashcards
1) Review the basics of embryology and how the different germ layers are formed. What are the 3 different germ layers? 2) Review cells and organelles if necessary.
blastomere
individual cells formed during the early cleavage stages of embryonic development
morula
small solid ball of blastomeres (cells)
- pluripotent
blastocyst
ball of cells that form after 6 days
- consists of the trophoblast (becomes placenta) and the inner cell mass (contains embryonic stem cells)
- blastocoele is the fluid cavity
- no longer pluripotent
implantation
blastocyst attaches to uterine wall, embryonic disc forms with amniotic cavity
embryonic disc
primitive streak begins to form (central axis of our body
primitive streak on ectoderm
cells differentiate at primitive streak and migrate to form a middle mesodermal layer
germ layers
ectoderm, mesoderm, endoderm
ectoderm (external)
neural tissue, skin
mesoderm
connective tissue, muscle, bone, blood
endoderm (internal)
epithelia, glands, GI tract
Gastrulation
A process where the embryo forms three layers of cells that will develop into different body parts
