. FiG. 33—Fetal and Maternal Placenta of Cow. The chorionic or fetal placental tufts are shown above and to the left, projecting downward, and to the right, into the placental crypts of the uterus. X310 (Pomayer). stitute the chorion. In all domestic animals the amnion and allantois each constitutes a sac containing considerable vol- umes of amniotic and allantoic fluids respectively. In uni- para, the allantoic sac normally pushes out to the apices of both uterine horns and to the os uteri internum, thus ac- quiring contact with the uterine mucosa throughout. In ruminants and swine, however,
. FiG. 33—Fetal and Maternal Placenta of Cow. The chorionic or fetal placental tufts are shown above and to the left, projecting downward, and to the right, into the placental crypts of the uterus. X310 (Pomayer). stitute the chorion. In all domestic animals the amnion and allantois each constitutes a sac containing considerable vol- umes of amniotic and allantoic fluids respectively. In uni- para, the allantoic sac normally pushes out to the apices of both uterine horns and to the os uteri internum, thus ac- quiring contact with the uterine mucosa throughout. In ruminants and swine, however, the tips of the allantoic sac early become necrotic in varying degree, as shown in Figs. 35 and 36. The necrotic portion retracts at times from the apex of the cornual cavity, leaving the lumen filled with pus and debris. In extreme cases, the entire non-gravid horn of the allantois of the cow becomes necrotic as shown in Plate
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Keywords: ., bookauthorwilliams, bookcentury1900, bookdecade1920, bookyear1921
