DEVELOPMENT OF THE GENITO-URINARY SYSTEM. 421 



FIG. 49. 



in the male. The other duct, which is external to the duct 

 of the Wolffian body, disappears, in the male, but becomes 

 the Fallopian tube, in the female. 1 This is known as the 

 duct of Miiller. Behind the Wolffian bodies, are developed 

 the kidneys and the suprarenal capsules. 



As the development of the "Wolffian bodies attains its 

 maximum, their structure becomes somewhat complex. From 

 their proper ducts, which are applied 

 directly to their outer borders, tubes 

 make their appearance at right angles 

 to the ducts, which extend into the 

 substance of the bodies and become 

 somewhat convoluted at their extremi- 

 ties. These tubes communicate di- 

 rectly with the ducts, and the ducts 

 themselves open into the lower part 

 of the intestinal canal, opposite to the 

 point of its communication with the 

 allantois. The tubes of the Wolffian 

 bodies are simple, terminating in sin- 

 gle, somewhat dilated, blind, extremi- 

 ties, are lined with epithelium, and 

 are penetrated, at their extremities, by blood-vessels, which 



1 HE^LE, Handbuch der systematischen Anatomic des Menschen, Braunschweig, 

 1866, Bd. ii., S. 342, 343; BRUCKE, Vorlesungen uber Physiologic, Wien, 1873, 

 Bd. ii., S. 289. 



The old idea was that the ducts of Miiller become the vasa deferentia, and 

 that the duct of the Wolffian bodies disappears, both in the male and in the fe- 

 male ; but later researches show that the testicles become united to the Wolffian 

 bodies, the remains of these bodies forming the head of the epididymis, and 

 that the Wolffian ducts become the vasa deferentia. In the Journal -of Anatomy 

 and Physiology, Cambridge and London, 1868, vol. ii., p. 401, is an account of a 

 case of true lateral hermaphroditism, observed by Dr. Rawdon, in which, in the 

 left broad ligament, there was a Fallopian tube, but no ovary ; while, in the 

 right broad ligament, were found, an ovary with its Fallopian tube, and a testi- 

 cle with an epididymis and a vas deferens. If this description be correct, it is 

 a strong argument in favor of the view that the Fallopian tubes and the vasa 

 deferentia are developed from distinct structures ; the Fallopian tubes, from the 

 ducts of Miiller, and the vasa deferentia, from the ducts of the Wolffian bodies. 



Foetal pig, % of an inch long ; in 

 the possession of Prof. Dai- 

 ton. 1, heart ; 2, anterior ex- 

 tremity ; 3, posterior extrem- 

 ity ; 4, Wolffian body. The 

 abdominal walls have been cut 

 away, in order to show the po- 

 sition of the Wolffian bodies. 

 (D ALTON, Human Physiolo- 

 gy, Philadelphia, 1871, p. 675.) 



