Figure 4
From: Physiological routes from intra-uterine seminal contents to advancement of ovulation
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)