338 STUDY OF PIG EMBRYOS. 



are irregularly distributed, although the cells are more or less grouped together. 

 The sympathetic tissue constitutes the dorsal part of the anlage and gives rise to 

 the so-called medulla of the adult organ. The ventral portion of the anlage, as 

 seen in the section, consists of bands or cords of cells separated from one another 

 by venous sinusoids. The cells are much more closely compacted in this portion 

 of the anlage than in the sympathetic, and they are further distinguished by hav- 

 ing nuclei which stain much less deeply. The cords of cells, here seen, develop 

 into the cortex of the adult organ. The fate of the medulla or .sympathetic portion 

 of the suprarenal in man is not known. The section passes through the side of 

 the allantois, and, therefore, shows only one of the lateral arteries, All.ar, but the 

 allantois still bears a number of degenerating mesothelial villi (compare page 253). 

 At the pelvic end of the abdomen a small bit of the Wolffian body, W.b, is 

 displayed. 



