Veterinary obstetrics, including the diseases of breeding animals and of the new-born . 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.
Veterinary obstetrics, including the diseases of breeding animals and of the new-born . 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 them intact. From this difference in 362 Veterinary Obstetrics. The Placenta 363 the mode of the separation or dehiscence of the fetal membranes,we divide mammalia into two groups, known as the deciduata,in which the maternal mucosa is torn awaj with the fetal mem-branes, and the indeciduata, in which the separation between thefetal membranes and uterus occurs between the villi of thechorion and the maternal vessels. By some authors, the term placenta is limited to those struc-tures in which the villi of the chorion are concentrated at cer-tain points upon its surface. These animals are designated asplacental. In other animals, the villi are scattered over the en-tire surface of the chorion and these are designated as diffuseplacental or aplacental. Among our domesticated animals, in the indeciduate group,we have, of the aplacental or diffuse placental type, the horse(Fig. 75) swine and camel, and of the placental group we havethe ruminants, except the camel. In the deciduous group ar
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