Embryonic and Placental Development

Pages :

2 pages

Format :

.doc

Published date :

11/26/2007

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Summary :

 
 

Table of Contents Embryonic and Placental Development  Table of Contents

 
  1. Early blastocysts
  2. Embryonic development after implantation
  3. Cytotrophoblast invasion of decidual vessels
  4. Germ layers
  5. Bibliography

Abstract

In a description of the earliest stages of the human blastocyst, the wall of the primitive blastodermic vesicle was characterized as consisting of a single layer of ectoderm. As early as 72 hours after ovum fertilization, the 58-cell blastula had differentiated into 5 embryo-producing cells and 53 cells destined to form trophoblasts (Hertig, 1962). Although trophoblasts have not been distinguished before blastocyst implantation, both cytotrophoblasts and syncy-tiotrophoblast are present in the earliest implanted blastocyst of the monkey. Indeed, evidence has been presented that chorionic gonadotropin (hCG) is secreted by cells of the human blastocyst at the time of implantation.

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About the author :

pencil image Marques T.  
Level :Advanced Study : Medical studies School/University : CAU

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