. La science et la pratique de la médecine . tions. Comme il n'est pas toujours facile de suivre les relations anatomiques des plusieurs couches de structures composant une invagination, il peut être utilisé pour donner un contour schématique de la thérolisation des couches séreuses et muqueuses de l'intestin dans une telle INTUSSUSCEPTION DES INTESTINS. 885 lésions; parce que, il est d'une importance pratique de se rappeler que, bien que les parties arc fortement déplacé, mais les relations anatomiques des surfaces séreuses et muqueuses de l'intestin ne sont jamais altérées.textures du même caractère anatomique sont toujours en cont

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. The science and practice of medicine . tions. As it is not always easy to follow the anatomi-cal relations of the several layers of structures composing an intus-susception, it may be of use to give a diagrammatic outline of therelation of the serous and mucous coats of the intestine in such INTUSSUSCEPTION OF THE INTESTINES. 885 lesions; because, it is of practical importance to remember that, al-though the parts arc greatly displaced, yet the anatomical relationsof the serous and mucous surfaces of the intestine are never altered.Textures of the same anatomical character are always in contactone with another, and the channel of the gut along its mucous sur-face is always open. That such is the case may be understood bytaking the Leg of a long stocking from which the toe-end has beencut off, so that the stocking may be converted into a continuoustube open at both ends. If one portion of the stocking be thendrawn into the other, a correct imitation of the relation of surfacesin an intussusception will be obtained. Fig. 68.. In the diagram (Fig. 68) the tube, a b, may be traced to be con-tinuous, as indicated by the arrows. The dotted line is meant tocorrespond to the serous surface, and the thick dark line to repre-sent the mucous surface of an intestine comprehending an intussus-ception. From the outer to the innermost surface at the site oflesion, on cutting through one layer, the first of the inclosing gut, a mucous surface is reached, which has a cul de sac reflection at c.Thus, the mucous surfaces of the including and the included por-tions of intestine are in constant apposition, rubbing against eachother. On cutting through the second layer of the intussusception, a serous surface is reached which has a cul de sac reflection at d.Thus, the serous surfaces of the includm^ and the included portionsof intestine are in constant apposition, rubbing against each other.At e the mucous canal is always more or less open in cases of simpleintussusception ; but the orif

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