Development Weeks 1-8

Development Weeks 1-8


This lesson will identify the stages of development of an embryo during the first 8 weeks of pregnancy.

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  • Embryonic Disk

    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.

  • Neural Tube

    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).

  • Sex Chromosomes

    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.

  • Fetus

    The developing baby after the first 8 weeks of development up to birth.

  • Miscarriage

    Also called spontaneous abortion, a miscarriage is when the embryo is expelled from the uterus.