Arterial Anomalies II5 
Fic. 20. Diagrams representing the positions of the bulbar and ven- 
tricular septa in simple transposition of the aorta and pulmonary arteries: 
I shows the position of the distal part of the aortico-pulmonary septum; 
II shows the position of the proximal aortico-pulmonary septum; III 
shows the possible arrangement of the great vessels in relation to the 
interventricular septum; IV shows the possible relation of the great ves- 
sels in relation to the ventricular chambers (heart normal and aorta opens 
from a tricuspid ventricle). 
Fic. 21. Diagram representing the possible arrangement of vessels and 
heart in transposition of the great vessels accompanied by dextro-cardia. 
Fic. 22. Diagram showing the possible arrangement of the ventricular 
chambers and the great' vessels in cases in which the bulbus rotates to the 
left and the ventricular loop to the right. 
Fic. 23. Diagram showing the possible arrangement of the ventricular 
chambers and the great vessels in cases of dextro-cardia, in which the 
vessels have developed normally. 
Fic. 24. Diagram representing the possible arrangement of the ven- 
tricular chambers and the great vessels in the cases of transposition in 
which the aorta is in front of the pulmonary artery but opens from a 
bicuspid ventricle. 
Fic. 25. This drawing was made from a dissection in our laboratory 
of a case in which the right subclavian artery arose from the beginning of 
the dorsal aorta and passed behind the cesophagus. The thoracic duct 
divided near the origin of the subclavian and opened on each side into the 
venous angle; see page —. 
Fic. 26. This figure, representing a case of true double aortic arch, was 
taken from Tiedemann (1822), fig. 7, Plate IV, representing a case de- 
scribed by Malacarne (1788), Pt. 2, p. 119; it was copied by Quain (1844) 
as fig. 8, Plate V, and by Krause (1876) as fig. 108d. 
Fic. 27. This figure, representing a case in which the arch alone is 
double, was taken from Tiedemann (1822), fig. 6, Plate IV, representing 
a case described by Hommel (1737). It is referred to in Haller Elem. 
Physiol., tom. 2, p. 162, and copied by Quain (1844) as fig. 7, Plate V, and 
by Krause (1876) as fig. 108d. 
Fic. 28. This figure, representing a case of right aortic arch with the 
left subclavian artery as the last branch and the ductus arteriosus patent, 
was taken from Quain (1844), fig. 2, Plate VII. 
Fic. 29. This figure, representing a case of right aortic arch with a left 
innominate trunk, was taken from Tiedemann (1822), fig. 9, Plate IV. 
Fic. 30. This figure, representing a case of persistence of both the right 
and left ductus arteriosus, was taken from Breschet (1826), fig. 9, Plate I. 
Fic. 31. This figure, representing the more or less common anomaly 
of left carotid artery springing from the innominate trunk, was copied 
from Tiedemann (1822), fig. 5, Plate II. 
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