BMB_1_18_11 - Chapter 3 Stages of Development Stages of...

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Chapter 3
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Stages of Development
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Stages of Development Frog Rat Cat Monkey Human What’s changing?
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15.5 weeks Term infant Stages of Development
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Prenatal Development Anatomical Changes: First month Blastocyst (hollow ball of cells) is formed (day 5) from the Blastocyst is implanted in uterine lining.
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Prenatal Development Anatomical Changes: First month Embryonic disc (flat plate across inside of blastocyst; day 8) Baby will be formed from the embryonic disc, and outer part of blastocyst will form umbilical cord, amniotic sac, etc.
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Formation of the Neural Tube Anatomical Changes: First month Cell differentiation begins, Neural plate forms Neural tube forms (day 18) Neural Crest becomes Autonomic Nervous System
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Formation of the Neural Tube
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Formation of the Neural Tube
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Some of the following pictures may be disturbing WARNING!
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Neural-Tube Defects Spina bifida -- severe Spina bifida occulta - mild
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BMB_1_18_11 - Chapter 3 Stages of Development Stages of...

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