anatomical orifice abdominal ostium of uterine tube http://purl.org/sig/ont/fma/fma77049 https://en.wikipedia.org/wiki/Ostium_of_uterine_tube The opening in the infundibulum of uterine tube into the abdominal cavity. In ovulation, the oocyte enters the Fallopian tube through this opening. It is surrounded by fimbriae, which help in the collection of the oocyte. Occlusion of this opening is referred to as distal tubal occlusion. abdominal ostium