48 OBSTETRICAL ANATOMY. 



uterus, which are also disseminated in the pavihon and its fimbriae ; 

 and an internal or mucous, which exhibits longitudinal rugae in the 

 tube, and radiated in the pavilion ; this membrane is covered by 

 ciliated epithelium, and its villi are greatly enlarged after impregnation. 

 It ceases abruptly at the margin of the fimbriae, where it meets the 

 peritoneum. 



The bloodvessels supplying the Fallopian tubes are derived from the 

 ovarian arteries, and their nerves are from the great sympathetic. 



Their function is to convey the spermatozoa of the male to the ovary 

 in the first instance, and afterwards to transmit the impregnated ovum 

 to the uterus or its horn ; in this respect they are the excretory ducts 

 of the ovaries. When the Graafian vesicle of the ovary ruptures, the 

 fimbriae of the tube grasp the ovary, and receive the ovum, which they 

 carry to the ovarian extremity of the canal ; this act, together with the 

 application of the pavilion to the ovary, takes place either through the 

 contraction of the non-striated muscular fibres which this part contains, 

 or from the swelling of the bulb of the ovary. At times, however, the 

 act is not properly accomplished, and the fecundated ovum, instead of 

 passing into the uterine cavity, escapes the fimbriae and falls into the 

 abdomen, where it constitutes that most remarkable form of gestation 

 termed extra-uterine. 



DiFFEKENCES. 



CoiLi, Sheep, and Goat. 



In the Cow, Sheep, and Goat, the fimbriated extremity of each tube 

 is expanded upon the outer margin of the ovarian capsule ; the inner 

 surface of the pavilion is beset with numerous fine oblique striae, and is 

 further increased by narrow folds or laminae converging toward the 

 contracted opening of the duct. The duct itself forms three or four 

 wavy folds, and is then continued along the walls of the wide ovarian 

 capsule to the extremity of the uterine horn, which makes an abrupt 

 curve to meet it. 



Pig. 



In the Pig the oviduct has few or no inflexions, but its length 

 is proportionately greater than in the other species. The paviUon 

 is wide and deep, and the margin of its abdominal opening is almost 

 even ; its inner surface is augmented by many loDg, narrow, and 

 highly vascular folds, which radiate from the commencement of the 

 contracted part of the tube upon the expanded pavilion. 



Bitch. 



In the Bitch the fimbriated commencement of the oviduct is attached 

 to the exterior boundary of the aperture, opposite the ovarium ; while 

 the tube itself, long and fine, passes in a wavy course round the 

 anterior aspect of the latter to the uterus. The length of the tube is 

 from two and a half to three and a half inches. 



SECTION IV.— THE OVARIES. 



The Ovaries {testes muliebres), the essential organs of generation in the 

 female, and analogous to the testes of the male, are two ovoid or elongate 

 reniform bodies, smaller than the latter, but of the same shape, and 

 situated in the abdominal cavity. They are loosely suspended in the 



