growth/size/body
• starting at E7-E7.5, embryos are much smaller
|
embryo
• at E7-7.5, embryos form empty sacs composed of parietal endoderm as the epiblast is forced into the proamniotic cavity
|
• mesoderm formation is initiated but the subsequent development is arrested during the mid-late streak stages
|
• at the mid-late streak stage
|
• starting at E7-E7.5, embryos are much smaller
|
• the posterior epiblast is forced into the proamniotic cavity by the thicker primitive streak
|
• thicker primitive streak that forces the posterior epiblast into to the proamniotic cavity
|