A Text book of Histology Arranged Upon An Embryological Basis
A Text book of Histology Arranged Upon An Embryological Basis
Philipp Sthr
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40), the portion of the net nearest the median line forms, on either side of the body, a longitudinal vessel, the dorsal aorta. The part of the net folded under the pharynx constitutes successively (beginning posteriorly) the vitelline veins, the heart, and the ventral aorta, and the latter . Are continuous in front of the pharynx with the dorsal aortae. The heart first appears as two dilated vessels, one on either side, which are parts of the general network. They are brought together in the m...edian line under the pharynx and fuse. At first the heart pulsates irregularly, but with the establishment of the circulation, its beats become rhyth- mical. The blood flows from the general network through the veins to the heart, and thence through the arteries back to the net. All the future vessels of the body are be- lieved to be offshoots from the en- FIG. 159. dothelial tubes jUSt described. They Blood vessels from a rabbit embryo of 13 days, . Developing as endothelial sprouts (en) from grOW OUt, as Shown in Fig.
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