The book Text book of the Embryology of Man And Mammals was written by author Wilhelm August Oscar Hertwig Here you can read free online of Text book of the Embryology of Man And Mammals book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Text book of the Embryology of Man And Mammals a good or bad book?
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The cells of the gelatinous connective tissue are partly spindle-shaped, partly stellate elements, the latter with widely branching processes. (2) The umbilical blood-vessels consist of two large arteries (art. Umbilicales), which conduct the blood from the embryo to the pla- centa, and a capacious vena umbilicalis, in which the blood flows back to the embryo after having traversed the placental circulation. The two arteries are wound spirally, like the umbilical cord itself, and are joined to ...each other by an anastomosis near their entrance into the placenta. They are very contractile, and exhibit a thick muscular membrane (tunica muscularis), consisting of circular and longitudinal fibres. (3) The canal of the allantois and the vitelline duct, which are essential components of the umbilical cord during the first months of pregnancy, subsequently undergo reduction, and are present at the end of embryonic life only in the form of insignificant remnants, as has been shown by KOLLIKER, AHLFELD, and HUGE.
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