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Detailed view of the region of the utero-tubal junction in a domestic pig to emphasize A) the prominent lymphatic vessels that serve to dilate the polypoid processes (B) during oestrus. This arrangement prevents the free passage of fluids – such as semen – from the lumen of the uterus into that of the Fallopian tube and offers a major route for transmission of signals via the lymphatic system. (After Andersen 1927)
