SUPRAKENAL CAPSULES. 



Wolffian body to take part in the formal ion of the suprarenal capsules have been derived by 

 proliferation from the germinal epithelium.) It had long: been believed that the two parts of 

 these organs, cortical and medullary, are separate in origin ; the former being derived, as was 

 thought, from cells which are of mesoblastic origin, the latter being developed in connection 

 wich the sympathetic ganglia. In elasinobranchs and some other lower vertebrates, they 



Fig. 144. INTERNAL ORGANS OP A FEMALE HUMAN FCETUS OF 3| INCHES LONG, OR ABOUT 14 WEEKS.- 



MAGNIFIED (from Waldeyer). 



o, the ovary full of primordial ova ; e, tubes of the upper part of the Wolffian body forming the 

 epoophoron (parovarium of Kobelt) ; W, the lower part of the Wolffian body forming the paroophoron 

 of His and Waldeyer ; ?', the Wolffian duct ; M, the Miillerian duct ; m', its upper fimbriated opening. 



Fig. 145. INTERNAL GENITAL ORGANS OF A MALE HUMAN EMBRYO OF 3i INCHES LONG (from Waldeyer). 



t, body of the testicle with seminal canals formed ; e, epididymis, or upper part of Wolffian body ; 

 W, Wolffian body, lower part, becoming paradidymis or organ of Giraldes : w' Wolffian duct, becoming 

 vas deferens ; g, gubernaculum. 



B 



Frg. 146. Two FIGURES EXHIBITING A COMPARISON BETWEEN PARTS OF THE GENERATIVE ORGANS IK 

 THE TWO SEXES (from Farre, after Kobelt). 



A. ADULT OVARY, PAROVARIUM AND FALLOPIAN TUBE. 



a, a, Epoophoron (parovarium) formed from the upper part of the Wolffian body ; b, remains of the 

 uppermost tubes, sometimes forming hydatids ; c, middle set of tubes ; e?, some lower atrophied tubes ; 

 c, atrophied remains of the Wolffian duct ; /, the terminal bulb or hydatid ; h, the Fallopian tube, 

 Originally the duct of Mliller ; i, hydatid attached to the extremity ; Z, the ovary. 



B. THE ADULT TESTIS AND EPIDIDYMIS. 



a, a, convoluted tubes in the head of the epididymis developed from the upper.part of the Wolffian 

 tody : b and /. hydatids in the hen,d of the epididymis ; c, coni vasculosi ; d, vasa aberrantia ; hj 

 remains of the duct of Mliller with i, the hydatid of Morgagni, at its upper end ; I, body of the testis. 



