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Uterine Horns

Ureter

In comparison to a human uterus, the pig uterus is greatly diminished in size, and acts as part of the birth canal rather than housing the developing fetuses. It is formed by the joining of the two uterine horns at the midline of the body, this is where the pig fetus develops. The vagina is located posterior to the uterus and merges with the urethra as it exits from the urinary bladder. Thus, in female pigs, both urination and birth occur through a single urogential opening. In human females the urethra and vagina are two separate canals.