THE WOLFFIAN DUCT. 



687 



body or primitive kidney of the embryo, whilst the Wolffian duct 

 corresponds to the primitive ureter. 



The epithelium lining the interval between the somatopleure 



Transverse section through the embryo of a chick on the second day where the me- 

 dullary canal is closed. (Kttlliker.) mr. Medullary canal, h. Epiblast. uwh. Cavity 

 of protovertebra uw. ung. Wolffian duct. mp. Mesoblast dividing into hpl. Somato- 

 pleure. df. Splanchnopleure. tp. Pleuroperitoueal cavity, dd. Hypoblast. ch. Noto- 

 chord. 



FIG. 277. 



Section of the inner part of the pleuroperitoneal cavity through the origin of the 

 genito-urinary organs. (Waldeyer.) L. Somatopleure. m. Splanchnopleure. a. Ger- 

 minal epithelium. C, o. Primitive ova. E. Mesoblast forming the ovary. WK. Wolf- 

 fian body. y. Wolffian duct. a'. Epithelium giving rise to the duct of M tiller 2. 



