. The development of the frog's egg; an introduction to experimental embryology. Embryology. B Fig. 48. — Three stages in the formation of the pronephros. (A and C after Field.) hollow Stalks are formed leading ventrally into the longitu- dinal canal of the segmental duct. A proliferation of cells from the somatic layer of the meso- blastic somites, dorsal to the pronephros, gives rise to a cover- ing of mesoderm for the pronephros, the pronephric capsule. A little later a protrusion of the splanchnic wall opposite to the funnels of the pronephros forms the glomus (Fig. 47, B). The glomus"
. The development of the frog's egg; an introduction to experimental embryology. Embryology. B Fig. 48. — Three stages in the formation of the pronephros. (A and C after Field.) hollow Stalks are formed leading ventrally into the longitu- dinal canal of the segmental duct. A proliferation of cells from the somatic layer of the meso- blastic somites, dorsal to the pronephros, gives rise to a cover- ing of mesoderm for the pronephros, the pronephric capsule. A little later a protrusion of the splanchnic wall opposite to the funnels of the pronephros forms the glomus (Fig. 47, B). The glomus" becomes filled with blood, and seems to have a direct connection with the dorsal aorta. The bulging portion of the glomus protrudes into the ccelom, and its cavity is sepa- rated from the coelomic cavity by only a single layer of cells. At the time when the embryo is hatched, the duct of the pronephros, the segmental duct, has fused with the wall of the cloaca, and the lumen of the duct opens into the digestive. 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 Morgan, Thomas Hunt, 1866-1945. New York, The Macmillan company; [etc. , etc. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectembryology, bookyear1
