. The elements of Embryology,. VIII.] THE DUCTUS BOTALLI. 219 chiefly in the complete separation of the pulmonary and systemic circulations. Fig. ItIN Diagram of the Aeterial System of the Adult Fowl. , right innominate artery. Tlie other letters as in Fig. 66. The dotted lines, as before, shew the portions of arches which have been obliterated. As the branches to the lungs become stronger and- stronger, less and less blood from the right ventricle enters into the dorsal aorta; and the connecting vessels become smaller and smaller. Each of the arches from the right ventricle may ther
. The elements of Embryology,. VIII.] THE DUCTUS BOTALLI. 219 chiefly in the complete separation of the pulmonary and systemic circulations. Fig. ItIN Diagram of the Aeterial System of the Adult Fowl. , right innominate artery. Tlie other letters as in Fig. 66. The dotted lines, as before, shew the portions of arches which have been obliterated. As the branches to the lungs become stronger and- stronger, less and less blood from the right ventricle enters into the dorsal aorta; and the connecting vessels become smaller and smaller. Each of the arches from the right ventricle may therefore be considered at about the sixteenth or eighteenth day as divided into two parts, an inner part which connects the heart with the lung, and an outer part which still connects the arch with the main dorsal aorta. As these outer parts become smaller they receive the name of the 'ductus or canales Botalli' or 'ductus arteriosi.' The one on the right side is short; that on the left side is much longer and narrower. Von Baer supposed that the reason of this was, that since the pulmonary- arch of the left side was the fourth, the ductus Botalli of that side consisted of the branch between the fourth and fifth arch,as well as between the fifth arch and the dorsal aorta. It is easy however from diagram (Fig. 66) to see that this. 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 resemble the original Foster, Michael. London : Macmillan
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
