Fertilization and Implantation + twins
Understanding Fertilization and Implantation
Test your knowledge on the fascinating process of fertilization and implantation, including twin development! This quiz is designed for anyone interested in embryology and reproductive science.
Key Topics:
- Fertilization process
- Embryonic development stages
- Types of twins
Penetration of the zona pellucida by spermatozoa:
- Is a consequence of releasing the acrosome enzymes of spermatozoa
- Is also called zona reaction
- Is called a decidua reaction
- Is the next step after dispersing of the follicular cells
- Is the process of dispersing of the follicular cells
- Fusion of the oocyte and sperm cell membranes follows the penetration of the zona pellucida
During the 1st week of embryonic development:
- Blastocyst is created
- Blastomeres increase in number
- Cleavage occurs
- Morula appears
- Primary yolk sac disappears
- Primary yolk sac appears
- The definitive yolk sac appears
- The extraembryonic mesoderm differentiate
- Trophoblast develops
- Inner cell mass (embryoblast) develops
- Zona pellucida is present
- Syncytiotrophoblast and the cytotrophoblast have evolved
- Embryoblast develops into two germ layers
HCG is produced by:
- Amnioblast
- Embryoblast
- Endometrial epithelium
- Exoxoelomic membrane
- Syncytiotrophoblast
- Hypoblast
- Primitive yolk sac
- Amnion Epiblast
- Cytotrophoblast
During the 2nd week of embryonic development:
- Bilaminar germ disc appears
- Blastomeres increase in number and size
- Cleavage occurs
- Embryoblasts differentiate into two germ layers – the epiblast and hypoblast
- Inner cell mass (embryoblast) develops
- Morula appears
- The definitive yolk sac appears
- Trophoblast develops
- Syncytiotrophoblast and the cytotrophoblast have evolved
- Trophoblast differentiates into the syncytiotrophoblast and cytotrophoblast
- Embryoblast develops
Blastocyst is composed of:
- Blastocyst cavity
- Embryoblast
- Endometrial stroma
- Inner cell mass
- Morula
- Uterine gland
- Trophoblast cells
Epiblast:
- Differentiate into the somatic and splanchnic mesoderm
- Gives rise to the secondary yolk sac (definitive yolk sac)
- Is composed of cells adjacent to the amniotic cavity
- Is composed of cells adjacent to the blastocyst cavity
- Together with the hypoblast creates bilaminar germ disc
- Cells separated from epiblast are amniogenic cells
Bilaminar germ disc:
- Appears at the embryonic pole of the blastocyst
- Develops during the 1st week of embryogenesis
- Develops during the 2nd week of embryogenesis
- Is composed of cytotrophoblast and syncytiotrophoblast
- Is composed of hypoblast and epiblast
- Is differentiated from the inner cell mass
Monozygotic twins:
- Are called “fraternal” twins
- Are genetically identical
- Are not genetically identical
- Are result of connection 2 eggs and 2 spermatozoa
- Develop from 1 zygote
- Develop from one zygote, which splits and forms two embryos
- Develop from two zygotes
- Develop from 3 zygotes
- Product of 1 oozyte and two seperate sperms
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