. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Fig. 95.—Isotoma. Cross section through first abdominal segment. {am. ser) Amnioserosa. {ggl) Gan- glion, (mge) Mid-gut epithelium. (neurp) Neuropile. Fig. 96.—Isotoma. Cross sec- tion of third abdominal segment. {am. ser) Amnioserosa. {go) Germ cells, (ggl) Ganglion. (mge) Mid-gut epithelium. (neurp) Neuropile. (ret) Ret- inaculum. mented brain is fully formed during the latter half of the developmental pe
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Fig. 95.—Isotoma. Cross section through first abdominal segment. {am. ser) Amnioserosa. {ggl) Gan- glion, (mge) Mid-gut epithelium. (neurp) Neuropile. Fig. 96.—Isotoma. Cross sec- tion of third abdominal segment. {am. ser) Amnioserosa. {go) Germ cells, (ggl) Ganglion. (mge) Mid-gut epithelium. (neurp) Neuropile. (ret) Ret- inaculum. mented brain is fully formed during the latter half of the developmental period, when also the ganglia of three gnathal segments fuse into the definitive subesophageal ganglia. Later also the cephalization and fusion of the abdominal ganglia take place (Fig. 94, ggl). In general, the devel- opment of the nervous system appears to follow the course of pterygote insects. The differentiation of the mesodermic somites in each segment begins about 10 days after egg deposition. Whether the absence of an epineural sinus is characteristic (Figs. 95, 96) or due to an artifact is not apparent. The laterodorsal muscles are derived from the somatic walls of the somites; mesad of this is the fat body (/); and still nearer the median fine, the ventral longitudinal muscles, both derived from the median somatic walls of the somites. The splanchnic wall of the somites furnishes the muscles of the ventriculus and later also takes part in the formation of the. 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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