Question regarding trimesters for biology class

Biology
Tutor: None Selected Time limit: 1 Day

Outline the three major prenatal periods, describe the events associated with each, and explain how the three germ layers participate in the formation of extra-embryonic membranes. 

Dec 6th, 2015

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Germinal Period: 1st 2 weeks of pregnancy. Zygote forms moves down the fallopian tubes. It then becomes a blastocyst and implants in the wall of the uterus.

Embryonic Period: Rapid cell division. The germ layers form. The blastocyst is now considered an embryo.

Fetal Period: Large increase in size. Maturation of body organs and systems.


Extra-embryonic membranes:

Yolk sac: consists of the endoderm and splanchnic mesoderm

Amnion: consists of the ectoderm and somatic mesoderm

The Chorio-Allantoic Membrane: consists of the ectoderm and somatic mesoderm

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Dec 6th, 2015

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