THE URINOGEXITAL SYSTEM 



385 



of the mesonephros are formed (Fig. 219). During its growth 

 forward a series of small diverticula arise from its wall and extend 

 dorsally (Fig. 223); these branch secondarily in a generally dichot- 



,'-''^i,< ■•'>"!■'■-■<- ■■■■---■: . - 





Af^Y. 



^y^ 



Fig. 222. -Transverse section through the metanephros, mesonephros 

 gonads and neighboring structures of an 11-day male chick, 

 a. A. S., Abdominal air-.sac. Ao., Aorta B W Rndv wall r^^i n 



duct. Mst., .Mesentery. M't'n., Metanephros. Sp., Spine of neural areh 



W D^'woMandScrotr' '\t """.'^' "*'. J e.^., Vna ca"™ Meri*: 

 vv . u., \^ oiman duct. Other abbreviations as before. 



