| Term | Definition |
|---|
| Compaction | Process by which blastomeres move and differentiate into inner and outer cell mass |
| Differentiation | Process by which cells acquire different fates |
| Embryoblast | Inner cell mass |
| Embryoblast | Forms embryo |
| Trophoblast | Outer cell mass |
| Trophoblast | Forms placenta |
| Embryoblast | Gives rise to epiblast and hypoblast |
| Trophoblast | Gives rise to snycytiotrophoblast and cytotrophoblast |
| Syncytiotrophoblast | Secretes hCG |
| hCG | Stimulates the corpus luteum |
| Corpus luteum | Secretes progesterone |
| Syncytiotrophoblast | Invades endometrium of uterus |
| Trisomy | Presence of three chromosomes |
| Aneuploidy | Missing or extra chromosomes |
| Nondisjunction | Chromosomes fail to separate in meoisis |
| Bilaminar germ disc | Consists of epiblast and hypoblast |
| Epiblast | primary ectoderm |
| Hypoblast | primary endoderm |
| Heuser's membrane | Consists of extraembryonic endoderm |
| Hypoblast cells | These cells migrate to line blastocyst cavity forming Heuser's membrane and the primary yolk sac |
| Yolk sac | The blastocyst cavity becomes this after it is lined by the primary endoderm |
| Extraembryonic mesoderm | The first mesoderm that is formed |
| Extraembryonic coelem | Formed by extraembryonic mesoderm |
| Chorion | Formed from extraembryonic mesoderm and trophoblast |
| Chorionic cavity | Another name for extraembryonic coelem |
| Chorion | Synthesizes hCG |
| Chorion | Gives rise to the placenta |
| Primary yolk sac | Degenerates in the chrionic cavity |
| Definitive yolk sac | Hypoblast cells proliferate and migrate to form this structure, thereby causing another structure to pushed away into the chrionic cavity |
| Yolk sac | Major site of blood formation in early embryo |
| Bilaminar germ disc | This structure is suspended in the chorionic cavity at the end of week 2 |
| Uteroplacental circulation | Maternal blood fills trophoblastic lacunae |
| Somatopleuric | Derived from extraembryonic mesoderm |
| Splanchnopleuric | Derived from extraembryonic mesoderm |
Combine with other sets
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