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THere are of the veynes innumerable & almost infinite surcles, yet al of them are saide to flow from fiue trunkes or bowes. For Anatomists doe account fiue especiall veynes. The hollow veyne, the Gate veyne, the vmbilicall veine, the arteriall veine and the venall artery. The Caua or hollow veyne is the largest of all the rest. It issueth out of the gibbous part of the Liuer, and is * 1.1 diuaricated or diuided into the stomacke, the spleene, the guts, and the Omentum or Kell. The vmbilical veine which is the Nursse of the infant runneth from the fissure or partiti∣on of the liuer vnto the Nauill, and whilest the infant is in the wombe it leadeth nourish∣ment vnto it, but after the birth it looseth that vse altogether and degenerateth into a liga∣ment. The arteriall veine hath both the name and office of a veyne, but is indeed an artery, and is all spent into the Lungs. The venall artery hath the coate and structure of a veyne, and might better be called a veine then an artery. The branches of this vessell are diuersly diuided and dispersed through the flesh of the whole Lungs. There are ther∣fore fiue vessels commonly called veynes, which we (because we endeuour to deliuer no∣thing but truth) will referre to two: the Hollow and the Gate veynes. For the vmbilicall * 1.2 veyne is a propagation of the Gate veyne, and is so continuated thereto that I cannot per∣swade my selfe but it is a branch thereof. The venall artery is a shoote of the hollow veine, as may bee prooued by that wonderfull inoculation in the heart of the infant before the birth, of which we spake in the 25 question of the fift booke, and the 15 chapter of the 6. The arterial veyne hath his continuity with the great artery, by the Arterial vessel in those places mentioned, and may rather be saide to be an artery then a veine, because it hath a double and thick coate. There remain therfore but two notable veynes, the Hollow and the Gate veynes. The rootes of both these veynes are confusedly sprinkled through the flesh of the Liuer, yet so that there are many moe rootes of the Gate veyne in the hollow side of the liuer, and fewer in the gibbous or conuex: on the contrary, there are many moe rootes of the hollow veyne which runne through the gibbous part of the liuer, and fewer through the hollow part: so that it seemeth sanguification is made rather in the hol∣low of the liuer, distribution and perfection in the gibbous or embowed part. The rootes of these two vessels (which hath beene obserued but of late yeares) are wonderfully ino∣culated one with another, for the extremities or ends of the rootes of the Gate veyne are * 1.3 fastened into the middle of the rootes of the hollow veynes, and the ends of the hollow veyne into the middle of the rootes of the Gate veyne, that so the bloud might flow and reflow out of one into another of them. Aristotle therefore in his second booke de par∣tibus Animalium saide true, (truer it may bee then hee wist, for haply hee had a Genius at his elbow) that all the veynes were continuall, yet Hippocrates before him hath the same thing in his booke de locis in homine; All the veynes saith he, doe communicate and flow mu∣tually * 1.4 one with and into another.
And this saith Lauren. I haue somtimes proued to be true in childrē new born, for if you put a hollow bugle into the vmbilicall veine and blow it, you shal perceiue that the guts, * 1.5 the branches of the hollow veyne, the heart and the very flesh of the Lungs will be disten∣ded because the vmbilicall veine endeth into the Gate veine. Now in the parenchyma or flesh of the liuer there are many inoculations of the gate and hollow veines. The hollow veine also hath a continuity with the venall artery, which is the proper vessell of the Lungs by a large hole. This therefore shall be the first and most generall diuision of the veines.
The peculiar differences of veynes are taken from their magnitude, number, site, of∣fice, and the name of the parts to which they are deriued. In regard of the magnitude * 1.6 some are great, some middle, some small. Great and large veines Hippocrates calleth 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉 hollow and sanguifluent because they yeelde aboundance of bloud if they be eyther wounded, or broken or opened. The lesser veynes are called Capillares, hairy or threddy veines because when they be diuided they yeeld, but slender and small streames of blood, and are easily stanched. Those parts that neede aboundance of nourishment or which are moued continually haue greater veynes. So the Lungs haue notable vessels, so the flesh and all hot and moyst parts haue great veynes; but bones, gristles, & ligaments very small veines.
From the number; some veynes are without companions, as that in the Chest called * 1.7