Lecture_3 - Gastrulation Humans: Diagram; similar to Fig...

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Gastrulation Humans: Diagram; similar to Fig 50-15b pg 1093  Late blastocyst/early gastrula Amnion End of gastrulation 3 germ layers Yolk sac  blood cells derived from this 16 day embryo 3D view: o Amnion is the bubble on top o Embryonic disc is inside the amnion (almond-shaped) o Yolk sac is beneath the amnion  Surface/primitive streak view: gastrulation  By 15 days: gastrulation complete  CW-Human Developmental Stages: Fig 50-15d and e, p. 1083  “Water breaking”: amniotic sacbreaking  For genetic testing: o Amniocentesis (See fig. 16-11, p 361, week 16) o Chorionic villi sampling (See Fig. 16-12, p 362, weeks 8-9) o Chorion is a tissue layer in the placenta Gastrulation occurs from the head end to the tail end  Organogenesis Development of organs o Neurulation  o Human neurulation—day 19: Fig 50-11 p 1089 Ectoderm—external layer o Top of the cells are the neural plate  o As the neural plate thickens, it starts to fold Mesoderm—middle layer Endoderm—inner layer 
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This note was uploaded on 04/06/2008 for the course BIOLOGY 102 taught by Professor Ta during the Spring '08 term at Rutgers.

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Lecture_3 - Gastrulation Humans: Diagram; similar to Fig...

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