. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. THE DEVELOPMENT OP THE UROGENITAL SYSTEM. 107 The mesonephros (Wolffian body), though largely developed in all vertebrates during foetal life, is not a persistent excretory organ of adult Fig. —Diagrams illustrating development of pronephros in the fowl (Haddon). ao, aorta; b. c, body-cavity; ep, epiblast with its epitrichial (flattened) layer; hy^ hypoblast; ni. s, mesoblastic somite ; n. c, neural canal; nch, notochord; p. t^ pronephr
. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. THE DEVELOPMENT OP THE UROGENITAL SYSTEM. 107 The mesonephros (Wolffian body), though largely developed in all vertebrates during foetal life, is not a persistent excretory organ of adult Fig. —Diagrams illustrating development of pronephros in the fowl (Haddon). ao, aorta; b. c, body-cavity; ep, epiblast with its epitrichial (flattened) layer; hy^ hypoblast; ni. s, mesoblastic somite ; n. c, neural canal; nch, notochord; p. t^ pronephric tubule ; so, somatic ; and sp, splanchnic, mesoblast. In the fowl recent investigation has shown that the Wolffian (segmental) tubes originate from outgrowths of the Wolffian f I-. 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 Mills, Wesley, 1847-1915. New York, D. Appleton
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