82 



EARLY EMBRYOLOGY OF THE CHICK 



embryo 



lateral amniotic fold 

 lateral body fold 



ex -embryonic 

 coelom 



shell 



shell 

 membrane 



albumen 



ectoderm ] som ato- 

 mesoderm 



splanch- 

 nopleure 



yolk 



vitelline 

 membrane 



amniotic cavity 



lateral 

 amniotic fold 



amnion 

 / somatopleure 



serosa 

 (somatopleure) 



embryo 



allantois I splanchnopleure 

 yolk stalk 



yolk-sac 

 /splanch- 

 nopleure j 



albumen 



vitelline membrane 



FIG, 30. 



