THE URINOGENITAL SYSTEM 



383 



duct is situated near the dorso-lateral edge of the mesonephros, 

 and the opening of a collecting tubule into it is shown in Figure 

 220. The renal corpuscles are situated next the median face of 

 the Wolffian body. The space between the tubules is occupied 



'7?.f.O.Z. 



^j//n/)S/?. - 



M't.-^^ 



Fig. 221. — Transverse section through the metanephros, mesonephros, 



gonads and neighboring parts of an 8-day chick. 



bl. v., Blood vessels (sinusoids). B. W., Body-wall. col. T. M't'n., 

 Collecting tubules of the metanephros. M. D., Miillerian duct. M's't., Mesen- 

 tery, n. t. i. z., Inner zone of nephrogenous tissue (metanephric). n. t. o. 

 z., Outer zone of the nephrogenous tissue. Symp. Gn., Sympathetic gang- 

 lion of the twenty-first spinal ganglion. V. C, Centrum of vertebra. Other 

 abbreviations as before. 



almost entirely by a wide vascular network of sinusoidal char- 

 acter; that is, the endothelial w^alls of the vessels are moulded 

 directly on the basement membrane of the tubules without any 

 intervening connective tissue. The circulation is described in the 

 chapter on the vascular system. 



