K12 Week 2: Difference between revisions
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Week 2 is then about this blastocyst attaching and implanting into the uterus wall. | Week 2 is then about this blastocyst attaching and implanting into the uterus wall. | ||
During this second week the blastocyst will stick to the inside of the uterus and will no longer float free. This sticking process is required to allow the blastocyst to begin to get food from the mother. | |||
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* The cells on the surface of the ball will not form part of the embryo and will go on to make the placenta and membranes that surround the embryo. | * The cells on the surface of the ball will not form part of the embryo and will go on to make the placenta and membranes that surround the embryo. | ||
* The cells on the inside form a small clump beside a fluid filled space. This small clump of cells (embryoblast) will form all the parts of the embryo. | * The cells on the inside form a small clump beside a fluid filled space. This small clump of cells (embryoblast) will form all the parts of the embryo. | ||
Question: You start as a single cell, how many cells are you now? | Question: You start as a single cell, how many cells are you now? | ||
Revision as of 20:53, 22 March 2011
Week 2
In the second week of development the dividing zygote forms a solid ball of cells and is now called a blastocyst.
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This movie shows human development between day 3 and day 6 after fertilization.
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- The cells on the surface of the ball will not form part of the embryo and will go on to make the placenta and membranes that surround the embryo.
- The cells on the inside form a small clump beside a fluid filled space. This small clump of cells (embryoblast) will form all the parts of the embryo.
Question: You start as a single cell, how many cells are you now?
Words Used
blastocyst - the name given to all the new cells formed from the first cell (the zygote).
implanting - this means to burrow into the uterus wall.
Cite this page: Hill, M.A. (2024, April 23) Embryology K12 Week 2. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/K12_Week_2
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
