K12 Week 2: Difference between revisions
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In the second week of development the dividing zygote forms a solid ball of cells and is now called a blastocyst. | 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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| <qt>file=Human_blastocyst_day_3-6.mov|width=500px|height=450px|controller=true|autoplay=false</qt> | |||
| valign="top" |This movie shows human development between day 3 and day 6 post-fertilization finishing with the blastocyst hatching at the beginning of week 2. | |||
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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. | ||
Revision as of 20:49, 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.
| width=500px|height=450px|controller=true|autoplay=false</qt> | This movie shows human development between day 3 and day 6 post-fertilization finishing with the blastocyst hatching at the beginning of week 2. |
- 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.
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.
Question: You start as a single cell, how many cells are you now?
Cite this page: Hill, M.A. (2024, April 26) 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
