A treatise on the science and practice of midwifery . to exist, nor is there any growth of 1 Mon. f. Geburt, Oct. 1862. ABNORMAL PREGNANCY 16 membrane around the ovum analogous to the decidua reflexa. Theovum is, therefore, comparatively speaking, loosely attached to itsabnormal situation, and hence hemorrhage from laceration of thechorion villi can very readily take place. It is seldom that any development of the chorion villi into distinctplacental structure is observed; this is probably owing to the fact,that laceration and death generally occur before the period at whichthe placenta is nor
A treatise on the science and practice of midwifery . to exist, nor is there any growth of 1 Mon. f. Geburt, Oct. 1862. ABNORMAL PREGNANCY 16 membrane around the ovum analogous to the decidua reflexa. Theovum is, therefore, comparatively speaking, loosely attached to itsabnormal situation, and hence hemorrhage from laceration of thechorion villi can very readily take place. It is seldom that any development of the chorion villi into distinctplacental structure is observed; this is probably owing to the fact,that laceration and death generally occur before the period at whichthe placenta is normally formed. The muscular coat of the tubesoon becomes hypertrophied, and, as the size of the ovum increases,the fibres are separated from each other, so that the ovum protrudesat certain points through them, and at these it is only covered by thestretched and attenuated mucous and peritoneal coats of the this time the tubal pregnancy forms a smooth oval tumor, which,as a rule, has not formed any adhesions to the surrounding structures Tulial Pregnancy. (From a Specimen in the Museum of Kings College.) (Fig. 77). The pari of the tube unoccupied by the ovum may beround unaltered, and permeable in both directions; or, more fre-quently, it becomes bo Btretched and altered thai its canal cannol bedetected. Most frequently it is that part of the tube nearest theuterus which cannot be made out. The condition of* the uterus inthis, as in other forms of extra-uterine pregnancy, has been the Bub-ject of considerable discussion. It is now universally admitted thaithe uterus undergoes a certain amounl of sympathetic engorgement,the cervix becomes softened, as in natural pregnancy, and themucous membrane develops into a true decidua. In many cases thedecidua is found on post-mortem examination, in others it is not;and hence the doubts that some have expressed as to existence. 168 PREGNANCY. The most reasonable explanation of its absence is that given byDuguet,1 who has
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