. Anatomischer Anzeiger. L'anatomie, l'Anatomie Comparée ;, comparatif. 450 c'est bj aucun moyen rare de trouver la veine grande azygos, suspendue par un mésentère "" de la plèvre, déposée dans une rainure dans le poumon et de couper la masse de substance appelée poumon de Wrisberg lobe. Cette anomalie est une large gamme de variation. Dans sa forme la plus complète le mésentère de la veine azygos a son attachement à la plèvre pariétale environ le long de la ligne de la première côte (Fig. 2). Dans de telles circonstances, le sommet du poumon est bifid (Fig. 3). Dans tous les cas de ce type proces- inflammatoire se peuvent faire l

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. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 450 It is bj no means uncommon to find the vena azygos major, suspended by a " mesentery" of pleura, lodged in a groove in the lung and cutting off the mass of lung substance called Wrisberg's lobe. This abnormality has a wide range of variation. In its most complete form the mesentery of the azygos vein has its attachment to the parietal pleura approximately along the line of the first rib (Fig. 2). In such circumstances the apex of the lung is bifid (Fig. 3). In any case of this type inflammatory proces- ses may lead to the replace- ment of the apical pleura by fibrous tissue. In ex- treme cases the existence of the pleural "mesentery" may be lost in a mass of fibrous tissue binding Wbisberg's lobe and the lung apex together and the azygos vein may then appear to emerge from the lung and may readily be supposed to come from the lung sub- stance — in other words to be a pulmonary vein. The mistake is the more liable to occur if dense adhesions surround the point at which the azygos vein enters the lung substance. This false type of " pulmonary " vein entering the superior vena cava is therefore the result of a pathological acquire- ment superadded to a con- genital variation. A case of. Fig. 1. Photograph to show heart and great vessels of a case in which four right pulmonary veins open into the superior vena cava which in turn opens equally into the right and left auricles. The crescentic upper margin of the inter-auricular septum is seen stretching across the mouth of the superior vena cava. this type has recently been observed in this laboratory. To find one or more true pulmonary veins opening into the superior vena cava is not very rare for pulmonary veins may open. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemb

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