A few questions about a developing human Fetus

[henree]

1. I am a visual person. Is there a video that can detail how the fetus breaks down surrounding molecules and synthesizes them for absorbtion.

Reading scientific journals is not helping. Or maybe someone can explain in laymans terms.

 

2. When the Sperm Pronuclei and Ovum Pronuclei combine inside the egg. Is the outer part of the Egg what becomes the placenta? Does the whole egg harbor all the processes of the development cycle?

 

3. Where do microtubles come from. Are they all ready inside of the egg or sperm? Or does the developing fetus create them?

 

 

 

[fiveworlds]

When the Sperm Pronuclei and Ovum Pronuclei combine inside the egg. Is the outer part of the Egg what becomes the placenta?

 

The trophoblast forms projections called chorionic villi which combine with the mother's uterus to form the placenta

3. Where do microtubles come from. Are they all ready inside of the egg or sperm? Or does the developing fetus create them?

http://atlasgeneticsoncology.org/Deep/CentrosomeStemCellID20105.html

Edited May 13, 2015 by fiveworlds

[fiveworlds]

Where do microtubles come from. Are they all ready inside of the egg or sperm? Or does the developing fetus create them?

 

After oocyte activation and completion of miosis the remaining nuclear material in the ovum reorganises to form the haploid female pronucleus. The spermatazoon swells becoming the haploid male pronucleus. The centrosome of the haploid male pronucleus nucleates microtubles to facilitate migration toward the female pronucleus. Amphimixis then occurs forming the diploid zygote with the normal 46 chromosomes. The diploid zygote then undergoes mitosis using substances now in the cell to replicate into the fetus.

 

The male pronucleus is blue the female pink

Edited May 13, 2015 by fiveworlds

[henree]

Awesome. Is there a video of this?