DEVELOPMENT OF URINARY AND GENERATIVE ORGANS 1423 



erulus. These tubules increase in number, and collectively constitute the mesonephros or 

 Wolffian body (Figs. 1178, 1179). At the beginning of the second month this body forms an 

 elongated spindle-shaped structure, which projects into the ccelomic cavity at the side of the dorsal 

 mesentery, and reaches from the septum transversum cephalad to the fifth lumbar somite caudad. 

 The Wolffian body persists and forms the permanent kidney in fishes and amphibians, but in 



( Stroma 



Genital \ of ovary, 

 ridge. \ Primitive J 

 [ ova. 



_,WoJffian duct. 



.Milllerian duct. 



--.Wolffian 

 tubules. 



CLANS OF 

 CLITORIS 



SPHINCTER 

 VAGINAE 

 MUSCLE 



ERECTOR 



CLITORIDIS 



MUSCLE 



ORIFICE OF 



URETHRA 



LABI 

 MINORA 



CARUNCULAE 

 MYRTIFORMES 



SPHINCTER 

 VAGINAE 

 MUSCLE 



TRANSVERSE 

 PERINEI 

 MUSCLE 



of the fourth day. (Waldeyer.) 



ms the permanent 

 ^hed to the 

 'He male 



EXCRETORY 

 DUCT 



GLAND OF 

 BARTHOLIN 



COMPRESSOR 

 URETHRAE MUSCLE 



TRANSVERSE 

 PERINEI MUSCLE 



FIG. 1177. The female external organs of generation dissected. (Spalteholz.) 



