. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 319. — A Meckersdiverticulum containingconcretions ; it commu-nicated with the lumenof the ileum by a narrowoijening protected by avalve. {After Sherren.) IMPERFORATE ILEUM 597 villous tufts wliicli fit into depressions of the oviduct. Evenin some mammals— guinea-pigs—the yolk-sac enters intovascular connexion with the uterine mucous are abundant and good reasons for Balfours conclusionsthat placental mammals are descendants of forms the em-br3^os of which had large yolk-sacs; but th
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 319. — A Meckersdiverticulum containingconcretions ; it commu-nicated with the lumenof the ileum by a narrowoijening protected by avalve. {After Sherren.) IMPERFORATE ILEUM 597 villous tufts wliicli fit into depressions of the oviduct. Evenin some mammals— guinea-pigs—the yolk-sac enters intovascular connexion with the uterine mucous are abundant and good reasons for Balfours conclusionsthat placental mammals are descendants of forms the em-br3^os of which had large yolk-sacs; but the yolk becamereduced in quantity owing to the nutriment the embryoreceived from the maternal tissues by means of the vascularconnexion of the yolk-sac with the uterine wall. Subse-. Fig. 320.—Septate ileum. {Museum of the Middlesex Rospital.) quently the function of the yolk-sac became limited by theallantois and the gradual evolution of the placenta, andfinally, so far as man is concerned, abolished. Thus in manit is vestigial, and, like such structures in general, is liable tomany vagaries. There is good reason to believe that the vitello-intestinalduct, besides being a source of cysts, is also responsible forthe curious defect in t,he ileum to which I have applied thename imperforate ileum. It occasionally happens that thelumen of the ileum is interrupted by a perforated diaphragm(Fig. 320). To such a condition the term septate ileum is 598 TVBULO-GYSTS applicable. When such a diaphragm is present its situationis so]iietimes indicated by a marked constriction of the other specimens a more or less perfect valve of this kind isassociated with a persistent duct. In such cases the ductopens into the ileum on the distal side of the valve. In otherinstances
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
