**caruncles in ruminants are the sites of maternal tissue contribution to the placenta + feotal cotyledon = placentome
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*The surface of the endometrium differs between species:
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**uterine folds in sows and mare.
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**Ruminants - Numerous round button like elavations of the endometrium called Caruncles occur. These are the sites of attchment and maternal tissue contribution to the placenta. Maternal Caruncle + feotal cotyledon = A placentome.
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**Sow and Mare - uterine folds are present.
*Not shed in domestic species, only shed in primates.
*Not shed in domestic species, only shed in primates.