320 



DEVELOPMENT OF THE EErRODUCTIYE ORGANS. 



liaritv of the mode of fusion accounts for the occurrence, as a rare 

 anomaly, not only of double uterus, but of duplicity of the vagina, 

 coincident with communication between two lateral halves of the uterus. 

 The next following part of the Miillerian duct, constitutes in animals 

 with horned uteri, the cornu of the uterus ; but in the human subject 

 it remains comparatively short, entering into the formation of the upper 

 part of the organ. The remaining upper portion of the Miillerian duct 

 constitutes the Fallopian tube — becoming at first open and subsequently 

 frino-ed at a short distance from its upper extremity. 



The pediculated hydatid of the fimbriated extremity (Hydatid of Morgagni) 

 appears to be the remains of the original upper end of the Miillerian tube. 

 The additional or accessory fimbrise and openings referred to at p. 471, and by 

 Henle in his Handbuch, vol. ii., p. 470, may admit of explanation on the suppo- 

 sition of the duct of Miiller having remained open at these places. 



In the human embryo of the third month the uterus is two-homed, and it is 

 by a subsequent median fusion and consolidation that the triangular body of the 

 entire organ is produced. The comua uteri, therefore, of the human uterus 

 con-espond with the separate comua of the divided uterus in animals, and this 

 explains the occasional malformation consisting in the gi-eater or less division of 

 the uterine cavity and vagina into two passages. There is no distinction in the 



Fig. 613. 

 A B 



Fig. 613.— Female Genital Okgans of the Embryo with the Remains of the 

 Wolffian Bodies (after J. Miiller). 



A, fi'om a foetal sheep ; n, the kidneys ; h, the ureters ; c, the ovaries ; d, remains of 

 ■Wolffian bodies ; c, Fallopian tubes ; /, their abdominal openings ; g, their union in the 

 body of the uterus. B, more advanced from a foetal deer ; a, body of the uterus ; b, 

 comua ; c, tubes ; d, ovaries ; e, remains of Wolffian bodies. C, still more advanced 

 from the hviman fcetus of three months ; a, the body of the uterus ; b, the round liga- 

 ment ; c, the Fallopian tubes ; d, the ovaries ; e, remains of the Wolffian bodies. 



human foetus in the third and fourth month between the vagina and uteras. In 

 the fifth and sixth months the os uteri begins to be formed, and the neck is sub- 

 sequently gradually distinguished. Thickening succeeds in the walls of the 

 uterine portion ; but this takes place first in the cervix, which up to the time of 

 birth is much larger and thicker than the body of the uterus (KoLLiker). 



In the meantime the Wolfiian bodies undergo a partial atrophy, and their ducts 



