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The ovarian bursa is a membranous sac of peritoneum that partially encloses the ovary in some mammals. It can be broadly open to the main body cavity, completely closed off, or connected by a narrow passage. In humans, the ovarian bursa is poorly developed, but in other primates and horses, it is more prominent. The ovarian bursa helps to increase the likelihood that ovulated eggs will enter the oviduct.12

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