mesosalpinx mesosalpinx the mesosalpinx is part of the lining of the abdominal cavity in higher vertebrates, specifically the portion of the broad ligament that stretches from the ovary to the level of the fallopian tube. mesosalpinxuterus and right broad ligament, seen from behind. (mesosalpinx not labeled, but region visible above ovary.)detailsidentifierslatinmesosalpinxta98a10.1.02.507fta23802fma19808anatomical terminology