APII Study Guide Home Page

Human Development Study Guide

Fertilization

http://gendertree.com/

Fertilization

 

 

Human development

http://www.people.virginia.edu/~rjh9u/

Zygote:

Cleavage

Cells divide but the zygote does not grow

Zygote

http://www.hybridmedicalanimation.com

Zygote:

Morula

 

Zygote

http://robby.nstemp.com/catalog.html

Zygote:

Blastocyst

Differentiates and implants.  The inner cell mass becomes the embryo and the surrounding trophoblast becomes the placenta.

Embryo

http://www.ou.edu/cas/zoology/

Embryo

implantation until week 9

Gastrulation

The neural tube begins to form and organogenesis begins.  (the division of tissue layers (endoderm, mesoderm, and ectoderm) into organs.

 

http://nobelprize.org/medicine/

Embryo

The embryo is producing hormones. The heart begins to beat and limb buds form

 

Fetus

http://pages.slic.com/rtlife/life.htm

Fetus

week 9 through 38