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vau'ina by a narrow canal that posses through tho posterior constriction of 

 the utt-rus (cervix), and which is, in Human anatomy, named the cavity (or 

 1'iinnl) <</'///- i-rroix (os uteri, os externum, os trices). In all tho domesticated 

 iininmls, except the Rabbit, the uterine canal is prolonged to the bottom of 

 tin- vagina, in something the same fashion as a tap is into tho interior of a 



1 ; ami in this way it always forms a very marked projection in the vaginal 

 cavity. Around this projection, the utero-vaginal mucous membrane is 



1 in transverse folds disposed in a circular manner, which give it the 



; ranee of a radiated flower; in Veterinary anatomy, this projection of 

 i is consequently named tho " expanded flower " fleur epanouie ; it 

 is the ti-nch's nose of the Human being. 



-- ! UCCTUEE. The walls of the uterus are composed of three membranes : 

 jui external, serous; a middle, muscular; and an internal, mucous ; with 

 vessels and nerves. 



The serous tunic envelops all the organ ; it is an expansion of the 

 broad ligaments, which are prolonged backwards on the posterior extremity 

 of the vagina, and are afterwards doubled in a circular fashion around that 

 canal, to pass over either the rectum, the bladder, or the lateral walls of the 



-. Between the two cornua this membrane forms a particular framum, 

 wli ifh is but slightly developed in Solipeds. 



The muscular layer comprises longitudinal (superficial), and circular 

 (deep) fibres, analogous to those of the small intestine. Near the insertion 

 of the broad ligaments, they give off a series of fasciculi which are pro- 

 longed between tho two layers of these ligaments. These are not the only 

 muscular fibres met with in the ligaments, however ; for Rouget has found 

 others throughout their whole extent, but particularly in the vicinity of the 

 ovaries. 1 (Around the cervix uteri, the circular fibres are most dense and 

 numerous.) 



In the pregnant animal, the number of fibres composing this layer is 

 much more considerable than in ordinary circumstances ; and this increase 

 lias for its object to permit the dilatation of the uterus, without allowing 

 its parietes to become too attenuated ; they do become more or less thin, 

 notwithstanding, according to the species. It has also been remarked that, 

 during pregnancy, the muscular fibres present a manifest striation. (The 

 nts of these fibres are short fusiform cells with long oval nuclei, mixed 

 with a large quantity of immature nucleated areolar tissue.) 



The mucous membrane is thin, delicate, and raised into folds. It is 

 covered by ciliated epithelium, which becomes cylindrical in the canal of 

 the cervix, and pavemcntal around the os uteri. (The cilia vibrate towards 

 the fundus of the organ. Tho membrane is closely connected with the 

 muscular tunic, and is composed of immature nucleated areolar tissue 

 without elastic fibres.) The uterine mucous membrane is destitute of 

 jia].ilhe (except at the cervix, where, according to Leyh, there are many 

 highly vascular papilltc ) ; but it lodges numerous simple or ramified glands, 

 which are straight or slightly Hexuoiis at their extremities. At the cervix, 



: glands enlarge at the bottom, and assume something of the appearance 



inous glands. 



so mucous glands are designated simple and cylindrical. The first 

 are most numerous towards tho cervix; some, hero and there, with their 

 orifices closed, arc enlarged, and form small vesicular tumours, the orula 



>hi ; they secrete the peculiar transparent mucus found here. Tho 



1 I'nstripcd contractile fibres are aloo found, in the mnle, along the spermatic cord* 



ml l.ivr "f the tunica 



