Excretory and Reproductive Systf 



83 



SPINAL CORD 



NEPHROSTOME 



GLOMERULUS ; 

 POSTCARDINAL VEIN 



MESONEPHRIC TUBULES 



PRIMITIVE DUCT 



MESENTERY 



PRONEPHRIC TUBULES 



Fig. 80. Stereogram of the developing pronephros and niesonephros. The cut 

 surface in foreground is anterior. (After Kingsley. Courtesy, Neal and Rand: 

 "Chordate Anatomy," Philadelphia, The Rlakiston Company.) 



MESONEPHRIC TUBULE 



MYOTOME 

 DERMATOME 



MESONEPHRIC TUBULES 

 NEURAL TUBE { 



CHORDA /; 



! GLOMERULUS NEPHROSTOME ! | GENITALR1DGE ! PRIMITIVE DUCT 



PERITONEUM POSTCARDINAL VEIN MESENTERY COELOM 



Fig. 81. Stereogram of the developing niesonephros; stage later than that of 

 Fig. 80. (After Kingsley. Courtesy, Neal and Rand: "Chordate Anatomy," Phila- 

 delphia, The Rlakiston Company.) 



