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CHAP. VIII. Of the Trunk of Vena ca∣va descending as far as to the Thighes.
THe lower Trunk of Vena Cava proceeding out of the Liver, called the descendent Trunk, is more narrow then the upper or ascendent (which servs very many parts) and proceeds undivided accompanied with with a great Arterie, as far as to the fourth Vertebra of the Loyns. Mean while it sends forth these folowing Boughes.
- I The Vene adiposae which servs the Coat of the Kid∣neyes and their Fat, the left of which, is commonly higher then the right.
- II The emulgent Veins, descending to the Kidneyes by a short and crooked passage, sometimes with a threefold Rise, bringing back the wheyish Blood being purified from the Kidnyes into the Vena Cava.
- 3. The Spermatick Veins of which in the first Book.
- 4. The Lumbaces or Loyn-veins somtimes two, som∣times three, which are carried betwixt the four Vertebra's of the Loyns. From these some write that they have ob∣served two Veins ascending, within the Vertebra's, on each hand to the side of the spinal marrow in the Brain, which makes them conjecture, that a portion of the semi∣nary matter is brought from the Brain.
These being thus constituted, the Trunk going towards Os sacrum, at the fourth Vertebra of the Loyns, it goes un∣der the Aorta, which before was under it, and is divided into two equal Branches, termed Rami Ilij or Iliaci, be∣cause they go over the Os Ilij and Os pubis unto the Thighes.
About the division it self, there arise two Veins; the Muscula superior serving the Peritonaeum and the Muscles of the Loyns and Belly, and the Sacra, somtimes single, otherwhiles double, for the Marrow of Os sacrum.
Afterward the Ramus Iliacus is forked out on each side into the external greater, and the internal lesser.
From the inner two Veins sprout; the Muscula media without, serving the Muscles seated on the outside of the Hip, and the skin of the Buttocks; and the Hypogastrica which is remarkable, somtimes double, serving very ma∣ny parts of the Hypogastrium, as the Muscles of Intestinum rectum, whence are the Haemorhoides externae; the Bladder and its Neck, the Yard, the lower side and neck of the womb. whence are those Veins by which menstrual Blood is many times thought to be purged in Virgins and Women with Child; which nevertheless seldom happens, when the Venae Hypogastricae do cumulate thick Blood, and send it not back unto the Trunck, then they may be opened, but otherwise, they are indeed suppressed; but they ascend unto the Heart by the Vena Cavae, and cause palpitations and other symptomes. But when they are right, the Courses are naturally voided by the Arteries, which appears by their florid color, and the common Of∣fice of the Arteries, which is to carry unto the parts of body. Walaeus proves this also by other tokens in his E∣pistles. This branch when it is joyned with the crural branch internal, doth cease.
From the outer, three: two before it goes out of the Peritoneum, and one afterward: the first is the Epigastri∣cae (which seldom arises from the crural) to serve the Peritoneum and Muscles of the Belly; the chief part as∣cends, under the right Muscles to the Mammariae, to which they are often joyned about the Navil.
2. The Vena pudendae, which serves the Privy Parts in Men and Women; it goes athwart to the middle of Os pubis.
3. Muscula inferior, going over the side of the Hip-joynt, to serve the Muscles and skin of that part.
Afterwards its Branches are termed Crurals.