258 



Xotes on the Wolffian Body of Higher Mammals 



5. Eelation of the Tubular Systems of the Testis axd Wolffiax 



Body. 



An intimate relation between the tnbular systems of these two orgaus- 



Avas spoken of in describing the human 

 organs. In pigs' embryos the same rela- 

 tion can be made out with much greater 

 distinctness, owing probably to the possi- 

 bility of obtaining fresh material. In the 

 pig the sexual gland is from the first very 

 closely connected with the Wolffian body. 

 It develops on the ventro-medial surface 

 of the anterior part of the organ appar- 

 ently from the cells covering this surface. 

 Later on tubules develop in the testis, 

 and the large characteristic sexual cells 

 in the ovary. The exact method of de- 

 velopment of these glands does not come 

 Avithin the scope of the present paper. 

 It is sufficient to note that in a pig's 

 embrvo 95 mm. long the testis tubules 



Fi(i. 16. Transverse section of 

 Wolffian body, testis and part of 

 the kidney of embryo pig 95 mm. 

 long'. K., tubules from testis break- 

 ing into the Malpighian body; T., 

 testis; K., kidney; W., Wolffian body, 

 W. D., Wolffian duct; M. D.. MUl- 

 leriau duct. 





^^; 













'''';?f^r''^;';'. 



are well developed, 

 showing well-marked 

 walls and a distinct 

 lumen. In the centre 

 of the gland and to- 

 wards the hilus the 

 tubules become very 

 narrow and enter a 

 mass of extremely fine 

 tubules which run to- 

 gether to the hilus of 

 the testis. These 

 tnbules are so small 

 that it is difficult to 

 observe a 

 many of 

 shown in ^i 



mass of tubules leaves .^iO;l^- a portion of the preceding; section with higher mag- 

 nification. K., tubules from testis; G., glomerulus; C, cavity 

 thp tpctia Einrl noa-ific; of tubule and Bowman's capsule. The entrance of the testis 

 uie LCMib ctnu pdb.Lfe tubules into this cavity can plainly be seen. 



directly over into the 



Wolffian body through the neck of tissue which joins the two organs. 



