The diseases of women : a handbook for students and practitioners . s probablyeight weeks for its completion (Fig. 80). When the oospermis retained in the isthmus or in the uterine section of thetube the abdominal ostium is rarely affected. In a fair pro-portion of cases the ostium dilates instead of is as yet no good explanation forthcoming in re-gard to these two opposite conditions, but they exercise animportant influence on the subsequent course of the preg-nancy. Microscopic investigation of the uterine end of the DISEASES OF THE FALLOPIAN TUBES. 231 tube serves to show
The diseases of women : a handbook for students and practitioners . s probablyeight weeks for its completion (Fig. 80). When the oospermis retained in the isthmus or in the uterine section of thetube the abdominal ostium is rarely affected. In a fair pro-portion of cases the ostium dilates instead of is as yet no good explanation forthcoming in re-gard to these two opposite conditions, but they exercise animportant influence on the subsequent course of the preg-nancy. Microscopic investigation of the uterine end of the DISEASES OF THE FALLOPIAN TUBES. 231 tube serves to show that it is not obstructed when the tubeis gravid. The Tubal Mole.—The changes which occur in theoosperm are the same whether it be lodged in a Fallopiantube or in the uterine cavity: in each situation it is liable tobecome converted into what is known as a 4 183k ostium. CYST Fig. 80.—Gravid Fallopian tube with completely occluded ostium. others measure 5 or even 8 cm. Small tubal moles areglobular, but after they attain a diameter of 3 cm. they as-sume an ovoid shape. The amniotic cavity usually occu-pies an eccentric position; occasionally the embryo is de-tected within it (Fig. 81). More often it escapes, or is de-stroyed by the original catastrophe which formed the no embryo, amniotic cavity, or chorionic villi can bedetected by the naked eye, a microscopic examination ofsections will lead to the detection of chorionic villi. Theyare very characteristic structures (see Fig. 52, page 166), 232 DISEASES OF WOMEN. and as certain evidence of tubal pregnancy as the embryoitself. It is an interesting fact that the blood in a tubal mole liesbetween the chorion and the amnion in a temporary spaceknown as the subchorionic chamber. This blood is derivedfrom the circulation of the embryo, and a large proportionof the red corpuscles are nucleated.
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