. Comparative anatomy. Anatomy, Comparative. VERTEBRATE EMBRYO. PRIMITIVE Fig. 336.—Diagram illustrating the hypothetical evolution of the urogenital system of vertebrates, beginning with the gonadic sacs of fiatworms. The diagram assumes that the gonadic sacs of flatworms have become the coelomic pouches of chordate embryos. The latter in turn unite to form the extended coelom of vertebrates. Coe- lomoducts appear first in annelids and become in vertebrates the renal tubules. Verte- brates "invent" a longitudinal (primitive) excretory duct. During phylogenesis the regio
. Comparative anatomy. Anatomy, Comparative. VERTEBRATE EMBRYO. PRIMITIVE Fig. 336.—Diagram illustrating the hypothetical evolution of the urogenital system of vertebrates, beginning with the gonadic sacs of fiatworms. The diagram assumes that the gonadic sacs of flatworms have become the coelomic pouches of chordate embryos. The latter in turn unite to form the extended coelom of vertebrates. Coe- lomoducts appear first in annelids and become in vertebrates the renal tubules. Verte- brates "invent" a longitudinal (primitive) excretory duct. During phylogenesis the region of proliferation of germ-cells becomes greatly Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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