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In this section, I must first tell you what I mean by the parts proper to a child in the womb; and they are only those that either help or nourish it; and whilst it is lodged in that dark repository of nature, and that help to clothe and defend it there and are cast away, as of no more use, after it is born, and these are two, viz., 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.