Source: Embryonic Disk; Public Domain: http://commons.wikimedia.org/wiki/File:Gray11.png
Also called spontaneous abortion, a miscarriage is when the embryo is expelled from the uterus.
The developing baby after the first 8 weeks of development up to birth.
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.
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).
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.