Veterinary obstetrics, including the diseases of breeding animals and of the new-born . layers of both the maternal and fetalcapillaries and an intervening layer of connective tissue. Thecapillaries of the allantois become greatly branched and grow outas villi which, sinking into the mucous membrane of the uterus,come into immediate contact with corresponding capillary loopsfrom the uterine and become closely adherent with eachother with extremely thin walls, through which there is a free The Placenta 361 exchange of nutritive and waste products, but not of cellularelements. The separ
Veterinary obstetrics, including the diseases of breeding animals and of the new-born . layers of both the maternal and fetalcapillaries and an intervening layer of connective tissue. Thecapillaries of the allantois become greatly branched and grow outas villi which, sinking into the mucous membrane of the uterus,come into immediate contact with corresponding capillary loopsfrom the uterine and become closely adherent with eachother with extremely thin walls, through which there is a free The Placenta 361 exchange of nutritive and waste products, but not of cellularelements. The separation of the fetal from the maternal circulation is socomplete that most micro-organisms of disease do not ordinarilj^pass through and, consequently, where the mother is affectedwith a contagious disease, the fetus does not ordinarily contractit through the medium of the blood. For example, in tubercu-losis the fetus is almost never infected during its intra-uterineexistence, but is born free from the malady, however badly themother has been affected during the period of Fig. 79. Cotyledons of a cow, according to Colin. u, Uterus. Ch, Chorion. C, Maternal, C^ fetal portion of and maternal portions are partly separated from each other.(Bonnet.) The area, or areas, in the mucosa of the uterus at which elabo-rate changes take place for the attachment and nutrition of thefetus, is known as the maternal placenta and the correspondingportion or portions of the chorion which sends capillary tuftsinto the placental area of the uterus, constitute the fetal placenta. Among our domestic animals, there are great variations be-tween these placentae. In some specieS; the relations existingbetween the fetal villi and the capillaries of the uterus are sointimate that, when the fetal placenta is removed, a portion of themucous membrane of the uterus is carried with it, while, inother animals, the placental villi of the fetus .separate from thematernal tufts and leave
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectveterinaryobstetrics
