Veterinary obstetrics, including the diseases of breeding animals and of the new-born . ted portion of the genital tube which serves to fix a bound-ary between the two cavities and to, in a measure, close theuterine cavity to the exterior. This canal is a somewhatelongated and tortuous channel, dependable for its length uponthat of the cervix ///<;;7. which it traverses, and for its width uponthe development and degree of contraction of the circular musclefibers of the latter. The cervix uteri consists of a constricted area of the uterus inwhich the circular muscle fibers are comparatively
Veterinary obstetrics, including the diseases of breeding animals and of the new-born . ted portion of the genital tube which serves to fix a bound-ary between the two cavities and to, in a measure, close theuterine cavity to the exterior. This canal is a somewhatelongated and tortuous channel, dependable for its length uponthat of the cervix ///<;;7. which it traverses, and for its width uponthe development and degree of contraction of the circular musclefibers of the latter. The cervix uteri consists of a constricted area of the uterus inwhich the circular muscle fibers are comparatively much morenumerous than in other portions of the organ. Posteriorly the The Uterus 27 cervix projects into the anterior end of the vagina for a distanceof I to 2 inches in the form of an obtuse cone varying in itstransverse diameter, but approximating its longitudinal dimen-sions. At the summit of this conical projection is the os uterior OS externum, with its mucous membrane thrown into conver-gent longitudinal folds, suggesting the appearance of a radiatingflower, y7(?«r Fig. 2. NoN-GRAviD Uterus of Mare viewed from aboviWITH Right Corni Laid Open. O, O, Ovaries. Ov, Oviduct. U, Uterus. UC, Uterine , Broad ligament. V, Vagina. Vu, Vulva. CI, , Hymen. 28 I eicnuary Obstetrics The origin of this projection of the cervix into the vaginaseems somewhat analogous to intestinal intussusception, a partialinvagination of the anterior portion of the genital tube into thevaginal cavity. At the time of parturition this projection andthe cervix as a whole becomes obliterated and the uterus andvagina temporarily indistinguishable except in the character oftheir mucosa. The dimensions and dilatability of the os uteri and cervicalcanal vary widely in individuals and at different times. Nor-mally, the mucosa of the circumference of the os 7cteri sho\\\6. bein contact. In the mare it should permit of the ready intro-duction of one or two fingers through it and alon
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectveterinaryobstetrics
