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Hence in the embryo, there is almost no use for the liver, but the umbilical vein passes directly through, a foramen or an anastomosis existing from the vena portae.
The way the ancients looked at this matter was, that the food, after being received into the alimentary canal, was then taken up by the branches of this great vein, which are called the 'vena portae', just as the roots of a plant suck up nourishment from the soil in which it lives; that then it was carried to the liver, there to be what was called "concocted," which was their phrase for its conversion into substances more fitted for nutrition than previously existed in it.
A man many do well or ill everywhere; but if what Bias says be true, that the greatest part is the worse part, or what the Preacher says: there is not one good of a thousand: "Rari quippe boni: numero vix sunt totidem quot Thebarum portae, vel divitis ostia Nili," the contagion is very dangerous in the crowd.
I, and indeed others, have sometimes found valves in the emulgent veins, and in those of the mesentery, the edges of which were directed towards the vena cava and vena portae.
The way the ancients looked at this matter was, that the food, after being received into the alimentary canal, was then taken up by the branches of this great vein, which are called the 'vena portae', just as the roots of a plant suck up nourishment from the soil in which it lives; that then it was carried to the liver, there to be what was called "concocted," which was their phrase for its conversion into substances more fitted for nutrition than previously existed in it.
For the blood entering the mesentery by the coeliac artery, and the superior and inferior mesenteries, proceeds to the intestines, from which, along with the chyle that has been attracted into the veins, it returns by their numerous ramifications into the vena portae of the liver, and from this into the vena cava, and this in such wise that the blood in these veins has the same colour and consistency as in other veins, in opposition to what many believe to be the fact.
"Ista civitas est Corpus Humanum: quinque portae sunt quinque Sensus: Palatium est Anima rationalis, et aureum pomum Similitudo cum Deo. Tria regna inimica sunt Caro, Mundus, Diabolus, et eius imago Cupiditas, Voluptas, Superbia." The above is a good instance both of the supernatural powers attributed to the poet, and the supernatural interpretation put upon his supposed exercise of them.
But in the incubated egg there are, as it were, two umbilical vessels, one from the albumen passing entire through the liver, and going straight to the heart; another from the yelk, ending in the vena portae; for it appears that the chick, in the first instance, is entirely formed and nourished by the white; but by the yelk after it has come to perfection and is excluded from the shell; for this part may still be found in the abdomen of the chick many days after its exclusion, and is a substitute for the milk to other animals.
Sunt geminae somni portae, quarum altera fertur Cornea, qua veris facilis datur exitus umbris: Altera candenti perfecta nitens elephanto, Sed falsa ad coelum mittunt insomnia manes. 'So if we put on sobriety and attention we shall find it a sure maxim in knowledge, that the more pleasant liquor of wine is the more vaporous, and the braver gate of ivory sendeth forth the falser dreams.
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