. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. UROGENITAL ORGANS. 119 participate in its formation. From this time on the prone- phric duct is usually called the mesonephric or Wolffian duct. The aorta likewise forms segmental twigs, which grow out to- wards the splanchnic layer of the nephrotome, and give rise to a series of vascular networks, the glomeruli, which differ from the glomus of the pronephros in that they project not into the larger body cavity (splanchnocoele), but into the cavity of the. Fig. 127. Diagram of the development of the nephridial system in the
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. UROGENITAL ORGANS. 119 participate in its formation. From this time on the prone- phric duct is usually called the mesonephric or Wolffian duct. The aorta likewise forms segmental twigs, which grow out to- wards the splanchnic layer of the nephrotome, and give rise to a series of vascular networks, the glomeruli, which differ from the glomus of the pronephros in that they project not into the larger body cavity (splanchnocoele), but into the cavity of the. Fig. 127. Diagram of the development of the nephridial system in the verte- brate. The pronephric system is according to the views of Semon; it is more prob- able that they arise from the nephrotomes instead of from the somatic layer, n, aorta; c, notochord; cv, cardinal vein; d, pronephric duct; g, glomus ; ^0, gonad; /, intestinal epithelium; m, myotome (muscular layer); mb, Malpighian body; mc, myoccele; mt, mesonephric tubule; ji, nephrotome; ns, nephrostome; pt, prone- phric tubule; sc, spinal cord; sg, spinal ganglion; sm, sympathetic ganglion; so, somatic layer; sp, splanchnic layer; z, cavity of nephrotome. Compare with Fig. 111. nephrotome, and in their segmental arrangement. The walls of the nephrotome close over each glomerulus, and are hence- forth known as Bowman's capsule, while the whole complex of capsule and glomerulus form a Malpighian body or corpuscle. The mesonephric tubule opens into Bowman's capsule by means of an inner nephrostome, while the lower portion of the nephro-. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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