, the umbilicars, or
navel vessels, and the secundinum. By the first it is nourished, and by
the second clothed and defended from wrong. Of each of these I shall
speak distinctly; and first,
_Of the Umbilicars, or Navel Vessels._
These are four in number, viz.:--one vein, two arteries, and the vessel
which is called the urachos.
(1) The vein is that on which the infant is nourished, from the time of
its conception till the time of its delivery; till being brought into
the light of the world, it has the same way of concocting the food we
have. This vein ariseth from the liver of the child, and is divided into
two parts when it has passed the navel; and these two are divided and
subdivided, the branches being upheld by the skin called _chorion_ (of
which I speak by and by), and are joined to the veins of the mother's
womb, from whence they have their blood for the nourishment of the
child.
(2) The arteries are two on each side which proceed from the back
branches of the great artery of the mother, and the vital blood is
carried by those to the child being ready concocted by the mother.
(3) A nervous or sinewy production is led from the bottom of the
bladder of the infant to the navel, and this is called _urachos_, and
its use is, to convey the urine of the infant from the bladder to the
alantois.
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