132 



TEXT-BOOK OF EMBRYOLOGY. 



Neural crest A 



( Cutis plate 

 Myotome ] 



I Muscle plate 



Scl. 1 



Pronephros - 



\ 



Parietal mesoderm 



Intestine 



Upper 

 limb bud 



Visceral mesoderm 



FIG. 104. Transverse section of human embryo of the 3rd week. Scl. 1 , Break in myotome at 

 point where sclerotome is closely attached. Kollmann. 



Neural tube 



Intersegmental 

 artery 



Intersegmental 



artery 



"^ Sclerotome 



Myocoel 



FIG. 105. Three primitive segments from sagittal section of human embryo of 

 the 3rd week. Kollmann. 



