. Chambers's encyclopedia; a dictionary of universal knowledge for the people. Fig 1.—Human Placenta (half of it beingand Umbilical Cord. spUt in two) There are two such types, the first of which is bestrepresented by the human placenta, and the latterby that of the pig. In animals exhibiting the first tvpe of placentalstructure, the mucous membrane lining the uterus. Fig. 2.—Diagrammatic Section of a Human PregnantUterus, with the contained Ovum : u, uterus; I, ovi met (cir Fallipian tube); c, cervix uteri (orreck of the womb); du, deeidua uteri; dr, decidua reflt-xa ;, decidua serotina :
. Chambers's encyclopedia; a dictionary of universal knowledge for the people. Fig 1.—Human Placenta (half of it beingand Umbilical Cord. spUt in two) There are two such types, the first of which is bestrepresented by the human placenta, and the latterby that of the pig. In animals exhibiting the first tvpe of placentalstructure, the mucous membrane lining the uterus. Fig. 2.—Diagrammatic Section of a Human PregnantUterus, with the contained Ovum : u, uterus; I, ovi met (cir Fallipian tube); c, cervix uteri (orreck of the womb); du, deeidua uteri; dr, decidua reflt-xa ;, decidua serotina : ch, chorion ; am, amnion ; al, allantois;7\b, umbilical vesicle ; z, villi, which form the fcetal part ofthe placenta ; z. villi over the rest of the chorion, which, inthe human subject, take no part in the placental function. undergoes a rapid growth and modification oftexture, becoming connected with the memhrnnadecidua, which is so called from its being thrown offat each parturition. For brevity, it is usuallytermed the decidua. This decidua is from an earlyperiod separable into three portions—the decidua PLACENTA. vera, or dmdua vtpri, which lines the general ca-\-ityof the uterus ; the d/cidua rejiexa, which imme-diately invests the ovum ; and the dccidua serotina,which is merely a special development of a part ofthe decidua vera at the part where the
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