How does the ovarian bursa help guide eggs into the oviduct in some mammals?

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Detailed cross-sectional illustration of a human ovary showing the stages of follicle development, ovulation, and corpus luteum formation, with labeled structures including primordial, primary, secondary, and mature follicles, a ruptured follicle releasing an ovum, and corpus luteum and albicans. An inset at the bottom shows the ovary's location in the female reproductive system. — ovary The steps of ovulation, beginning with a dormant primordial follicle that grows and matures and is eventually released from the ovary into the fallopian tube.

In many mammals, the ovarian bursa functions as a membranous sac of peritoneum that traps a portion of the coelom to create a chamber around the ovary. By enclosing the ovary within this periovarian space, the bursa effectively restricts the area into which eggs are released. This structural arrangement increases the probability that all ovulated eggs will be directed into the oviduct rather than being lost in the main body cavity.1