Lecture - Week 1 and 2 Development: Difference between revisions
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==Cleavage of Zygote== | ==Cleavage of Zygote== | ||
[[Movie_-_Embryo_Mitosis|Movie - Early Cell Division]] | [[Development_Animation_-_Week_1|Movie - Week 1 Cell Cleavage | [[Movie_-_Embryo_Mitosis|Movie - Early Cell Division]] | [[Development_Animation_-_Week_1|Movie - Week 1 Cell Cleavage]] | ||
* cleavage of zygote forms 2 blastomeres and is cleavage with no cytoplasm synthesis | * cleavage of zygote forms 2 blastomeres and is cleavage with no cytoplasm synthesis | ||
** special "embryonic" cell cycle S phases and M phases alternate without any intervening G1 or G2 phases (MSMSMSMS, adult MG1SG2) therefore individual cell volume decreases | ** special "embryonic" cell cycle S phases and M phases alternate without any intervening G1 or G2 phases (MSMSMSMS, adult MG1SG2) therefore individual cell volume decreases | ||
Revision as of 14:22, 1 August 2011
2010 Lecture | Zygote | Blastocyst | Implantation
Objectives
- Understand the events during week 1 of development (Zygote, Blastomeres, Morula, Blastocyst)
- Understand the events during week 2 of development (Trophoblast, Syncytiotrophoblast, Cytotrophoblast, Embryoblast, Implantation)
- Brief understanding of early placentation
- Brief understanding of maternal changes
Zygote Formation
- zygote is the first diploid cell formed following fertilisation.
- male and female pronuclei, 2 nuclei approach each other and nuclear membranes break down.
- DNA replicates, first mitotic division
- sperm contributes centriole which organizes mitotic spindle
Movie - Pronuclear Fusion | Movie - Parental Genomes
- Conceptus - the term refers to all material derived from this fertilised zygote, includes both the embryo and the non-embryonic tissues (placenta, fetal membranes).
Cleavage of Zygote
Movie - Early Cell Division | Movie - Week 1 Cell Cleavage
- cleavage of zygote forms 2 blastomeres and is cleavage with no cytoplasm synthesis
- special "embryonic" cell cycle S phases and M phases alternate without any intervening G1 or G2 phases (MSMSMSMS, adult MG1SG2) therefore individual cell volume decreases
- cell division is initially synchronous, then asynchronously
- slow- centre cells, larger fast- peripheral cells
Co-ordinator Note
Dr Mark Hill |
ANAT2341 Embryology S2 2011
|
Course Content 2011
2011 Timetable: | Embryology Introduction | Fertilization | Cell Division/Fertilization | Week 1 and 2 Development | Week 3 Development | Week 1 to 3 | Mesoderm Development | Ectoderm, Early Neural, Neural Crest | Trilaminar Embryo to Early Embryo | Early Vascular Development | Placenta | Vascular and Placenta | Endoderm, Early Gastrointestinal | Respiratory Development | Endoderm and Respiratory | Head Development | Neural Crest Development | Head and Neural Crest | Musculoskeletal Development | Limb Development | Musculoskeletal | Renal Development | Genital | Kidney and Genital | Sensory | Stem Cells | Stem Cells | Endocrine Development | Endocrine | Heart | Integumentary Development | Heart and Integumentary | Fetal | Birth and Revision | Fetal
Glossary Links
- Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link
Cite this page: Hill, M.A. (2024, May 23) Embryology Lecture - Week 1 and 2 Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Lecture_-_Week_1_and_2_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
