424 



DISSECTION OF THE PELVIS. 



Shedding of 

 an ovum : 



corpus 

 luteum. 



Artery ; 



veins ; 



circumference of the organ, and sometimes they may be seen 

 projecting through the fibrous coat. 



When the Graafian vesicle is matured it bursts on the surface of 

 the ovary, and the contained ovum escapes into the Fallopian tube. 

 After the shedding of the ovum the ruptured vesicle gives origin 

 to a yellow substance, corpus luteum, which finally changes into a 

 cicatrix (b). 



Blood-vessels and nerves. The ovarian artery pierces the ovary at 

 the attached border, and its branches run in zigzag lines through 

 the stroma, to which and the Graafian vesicles they are distributed. 

 The veins begin in the texture of the ovary, and after escaping 

 from its substance, forms a plexus (pampiniform) within the fold of 

 the broad ligament. The nerves are derived from the sympathetic 

 on the ovarian and uterine vessels. 



Appendage 

 to ovary : 



situation : 



form ; 



structure. 



Parovarium or organ of Rosenmuller (epoophoron of "Waldeyer ; fig. 156 &). 

 On holding up the broad ligament of the uterus to the light, a collection of 

 small tortuous tubules will be seen between the ovary and the Fallopian tube. 

 These are the remains of the upper part of theWolffian body of the foetus, and 

 correspond to the vasa efferentia of the testicle in the male. The mass is 

 about one inch broad, with its base to the Fallopian tube and its apex towards 

 the attached border of the ovary. The small tubes are from twelve to twenty 

 in number ; at the wider end they are joined more or less perfectly by a tube 

 crossing the rest (the remnant of the Wolffian duct), which is prolonged some- 

 times a short way into the broad lignment. 



Fallopian 

 tube: 



length ; 



and form ; 



it is dilated 

 externally, 



and fimbri- 

 ated; 



size of the 

 canal is 

 least at the 

 ends. 



A muscular 

 structure ; 



fibres pro- 

 longed from 

 uterus. 



Mucous 

 coat 



FALLOPIAN TUBES (fig. 156, e). Two in number, one on each 

 side, they convey the ova from the ovaries to the uterus. 



Each is about four inches in length ; cord-like at the inner end, 

 where it is attached to the upper part of the uterus, it increases in 

 size towards the outer end, and terminates in a wide extremity (/), 

 like the mouth of a trumpet. This dilated end is fringed, and the 

 pieces are called finibrice. When the fimbriated end is floated out 

 in water, one of the processes (the ovarian fimbria ; g) may be 

 seen to be fixed to the distal end of the ovary. In the centre of 

 the fimbria is a groove leading to the orifice of the Fallopian 

 tube. 



On opening the tube with care, the size of the contained space 

 and its small aperture into the uterus can be observed. Its canal 

 varies in size at different spots ; the narrowest part is at the orifice 

 into the uterus (ostium utermum), where it scarcely gives passage 

 to a fine bristle ; towards the outer end it increases a little, but it 

 is rather diminished in diameter at the outer aperture (ostium 

 abdominale). 



Structure. This tube has the same structure as the uterus with 

 which it is connected, viz., a muscular layer covered externally by 

 peritoneum, and lined by mucous membrane. 



The muscular coat is formed of an external or longitudinal, and 

 an internal or circular layer ; both these are continuous with similar 

 strata in the wall of the uterus. 



The mucous membrane forms longitudinal folds, particularly at the 

 outer end. At the inner extremity of the canal it is continued 



