DEVELOPMENT OF NERVOUS SYSTEM 



neiral greove 



753 



Neurenteric canal 



Primitive groove _ 



Body-stalk 



Chorion with 

 villi 



Fore-brain 



neural groove 



Amnion (cut 



>>j — Mid-brain 

 Hind-brain 



Somite VII 



Body-stalk 



B' 



neural groove closing 



ectoderm 



c 



Amnion 



Fore -brain 



Neurent. canal — -^ 



LNeural tube 



Open tube 



Primitive groove 



GaDgUon Crest 



D 



/ 'neural tube 



D 



