K12 Week 2: Difference between revisions

From Embryology
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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.
{|
| <qt>file=Week2_001.mov‎|width=250px|height=240px|controller=true|autoplay=false</qt>
| This movie shows the process of implantation that occurs during most of week 2 of human development.
|}


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 21:57, 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 after fertilization.


The movie finishes with the blastocyst hatching just before the beginning of week 2 in development.


Week 2 is then about this blastocyst sticking (attaching) and burrowing (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.

  • 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.


width=250px|height=240px|controller=true|autoplay=false</qt> This movie shows the process of implantation that occurs during most of week 2 of human development.

Question: You start as a single cell, how many cells are you now?


K12 Links: Start Here | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 to 8 | Arms and Legs | Heart | Fetus | Brain Growth | Eyes and Ears | Animal Development Times | Humans and Animal Embryology | Comparative Embryology | Thalidomide

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, March 28) Embryology K12 Week 2. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/K12_Week_2

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G