engaged in the cup 15 the rim 17 of the cup 15 is at the fornix 33 of the vagina 32 light from the fiber optic bundle 27 passes through the body 11 from the end 13 of the stem 12 and exits from the rim 17 of the cup 15 trans illuminating the fornix 33 the fornix 33 is thus visible and defined inside the body cavity for the purpose of executing surgical or medical procedures the trans illuminator 10 illuminates the fornix 33 and demonstrates to a surgeon exactly where the tissues are to be cut to remove the cervix 30 from its surrounding attachments during an abdominal hysterectomy blood loss is decreased and easy side to side approximation of the tissues of the vagina 32 is carried out over the rim 17 of the lighted trans illuminator 20 as shown in fig6 the body 11 of the trans illuminator 20 is in the vagina 32 with the cervix 30 of the uterus 31 engaged in the cup 15 the rim 17 of the cup 15 is at the fornix 33 of the vagina 32 the light as shown in fig5 from the fiber optic bundle 27 passes through the body 11 from the end 13 of the stem 12 and exits from the rim 17 of the cup.