Source: Miscarriage image, Creative commons: http://upload.wikimedia.org/wikipedia/commons/0/0b/Human_Embryo_-_Approximately_8_weeks_estimated_gestational_age.jpg; Neural Tube, Public Domain: http://en.wikipedia.org/wiki/File:Gray18.png
Part of the inner cell mass of the blastocyst, the embryonic disk is the cellular framework that begins embryonic development; the nervous system develops from ectoderm of this.
The developing baby after the first 8 weeks of development up to birth.
Also called spontaneous abortion, a miscarriage is when the embryo is expelled from the uterus.
A tube formed from the ectoderm of the blastocyst that serves as the framework for the development of the central nervous system (brain and spinal cord).
The X & Y chromosomes that when paired determine the gender of the child and carry other genetic traits as well; XX = female while XY = male.