. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Fig. 324.âSciara. Cross section of 60-hour embryo. Differentiation of somatic (som. m) and splanchnic {splm) mesoderm, (ect) Ectoderm, {mge) Mid-gut epithelial ribbons, {nc) Nerve cord. at the fiftieth hour to form two narrow strands of mid-gut epithelium connecting the stomodaeum and proctodaeum. These strands now grow broader until they meet and join along the mid-ventral line to form a shallow trough in
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Fig. 324.âSciara. Cross section of 60-hour embryo. Differentiation of somatic (som. m) and splanchnic {splm) mesoderm, (ect) Ectoderm, {mge) Mid-gut epithelial ribbons, {nc) Nerve cord. at the fiftieth hour to form two narrow strands of mid-gut epithelium connecting the stomodaeum and proctodaeum. These strands now grow broader until they meet and join along the mid-ventral line to form a shallow trough in which the yolk rests. The U <\ J, : â N. ^^^ ^. b'. ^ggi ect- FiG. 325.âSciara. Cross section of 85-hour embryo, (ect) Ectoderm, (ggl) Ganglion. (mge) Mid-gut epithelium, {som. m) Somatic mesoderm, {splm) Splanchnic mesoderm. iv) Yolk. cells at the outer edges of the trough continue to divide so that the trough increases in depth until at the ninetieth hour it has grown completely around the yolk and the edges have fused on the dorsal side to form a tube, the mid-gut. The closure of the dorsal wall of the mid-gut occurs. 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 Johannsen, O. A. (Oskar Augustus), 1870-1961; Butt, Ferdinand Hinckley, 1899-. New York, London, McGraw-Hill Book Company, inc.
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
