652 



EMBRYOLOGY : CHICK 



mes. 



mes. 



B 



Fig. 510. — Diagrammatic sections of the chick embryo to show the relations of 

 layers and folds. A, longitudinal; B, transverse. 



a.c, amniotic cavity ; a.f., false amnion ; a. p., true amnion ; al., allantois ; c, Coelom ; e., embryo ; ent., 

 enteron ; ep., ectoderm; hyp., endoderm ; mes., mesoderm; mty., mesentery; nch., notochord ; 

 s.c, spinal cord ; y.s., yolk sac. 



