Physio Bio Week 5

• Zygote - The cell formed by the two merged reproductive cells.
• Embryo - An organism in its early stage of development; in humans,

  • 2 - 8 weeks
• Fetus - The unborn offspring;
• Germ layer - One of the first three layers. differentiate in the developing embryo
• Ectoderm - skin and neural tissue
• Mesoderm - form connective tissue such as ligaments, muscles, blood vessels, and the urogenital

  systems.
• Endoderm - source of many internal organs
• Neural plate - A layer formed by differentiating neural cells within the embryonic ectoderm.
• Inducing factor - A chemical that produces cell differentiation
• Neural tube - A structure formed by the developing embryonic neural plate that will eventually form the brain and spinal cord