07 Embryology - Lecture Notes Embryology How do we go from...

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Lecture Notes 9/19/07: Embryology 15/10/2007 18:15:00 How do we go from a single cell to a whole body? What is the basic body plan? use online PDF (from Liem et al) on LS2 website Embryology  helps explain why and how the body gets its shape body is largely a set of folding tubes and sheets, each of which derives from  three initial layers of cells embryos create complexity! the body’s many parts fit and work together  because how they grow:  a hierarchical (branching) process with many  interactions between units basic answer: many organisms are dried, evolved fish First Stages of Life     begin with a  zygote  (single cell) o human body has about 350 diff kinds of cells, each with: membrane cytoplasm nucleus o all cells have four basic functions: multiplication movement change character (differentiate)
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signal to other cells o zygotes derive from two gamete cells – sperm and egg Fertilization: 12-24 hrs after ovulation One-Cell Stage: two pronuclei fuse (zygote) First cleavage occurs ~ 30 hrs after ovulation First week of life cells become smaller, from intoa ball o morula , 12-32 cells o blastula , 128 cells, around a central cavity 2 cell stage   4 cell stage   morula   blastula cells in the blastula begin to change character (differentiate) o inner cell mass   embryoblast (future organism)
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07 Embryology - Lecture Notes Embryology How do we go from...

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