6 Questions
When is the fetus said to begin to have a human appearance?
By the end of the embryonic period
Which part of the body is formed by the beginning of the 5th week?
Forelimbs & hindlimbs
During which period do the tissues, organs, and systems start to form?
The embryonic period
Which structure arises as a thickening of the surface epithelium during development?
Ears
How is age usually determined during embryo development?
By measuring the 'crown-rump' length
At what point are all the main 'systems' of the body established during development?
By the end of 8th week
Learn about the different stages of human embryonic development, from the fertilized ovum to the formation of tissues, organs, and systems, and the growth during the fetal period. Understand the changes that occur internally with the three germinal layers: ectoderm, mesoderm, and endoderm.
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