Anatomy and Cell Biology 3319 Lecture Notes - Lecture 2: Zona Pellucida, Neural Tube, Anal Canal

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Describe where fertilization and implantation normally occur. Describe the fate of the inner cell mass and trophoblast during the week two of development. Identify the 3 germ layers and describe 2 anatomical structures derived from each layer. Describe the formation of the neural tube (lecture 5) The first 4 weeks, the embryo already has the same body plan as an adult: week 1: fertilization, week 2: bilaminar embryo, week 3: tri-laminar embryo, week 4: development of neural tube. Week 3-4, the embryo has already developed a neural tube (3. 5 mm) Usually, it is week 5 or 36 days when a woman finds out she"s pregnant. (10 mm: teratogens are environmental compounds (e. g. alcohol, cocaine) that can cause birth defects, the embryonic stage is particularly susceptible to teratogens. By week 8, the embryo already has the body plan of a person. (30 mm) Fetus is contained in the amniotic sac and placenta. It communicates with the mother via umbilical cord.

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