. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Pig. 351.—Scolopendra cingulata. Cross section of trunk, left half, (mes) Mesoderm. {mst) Median strand, (p) Leg. {vm) Membrana ventralis. {Adapted from Heymons.) later fuse into a single ganglion (Figs. 348, 352, ggv, mst). Certain cells in contact with the ganglion cells laterally, which were drawn in with them, develop into the neurilemma. Before the median fusion of the ganglia, the neuropilar fibers fo
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Pig. 351.—Scolopendra cingulata. Cross section of trunk, left half, (mes) Mesoderm. {mst) Median strand, (p) Leg. {vm) Membrana ventralis. {Adapted from Heymons.) later fuse into a single ganglion (Figs. 348, 352, ggv, mst). Certain cells in contact with the ganglion cells laterally, which were drawn in with them, develop into the neurilemma. Before the median fusion of the ganglia, the neuropilar fibers form a continuous longitudinal strand without neuroglia cells. After the first molt and after fusion of the ganglia, neuroglia cells, probably originating from the middle cell strand, are interspersed. Thus the connectives arise. With the fusion of the. vm Fig. 352.—Scolopendra dalmatica. Cross section of anlage of a rump ganglion, (bl) Blood cell, (coel) Coelome. {ep) Epidermis, (ggv) Ganglion pit. (mst) Median strand. {mus) Muscle, (n) Nerve, {neur. p) Neuropile. {sin) Sinus, {vbl) Vasoblasts. {vm) Membrana ventralis. {Adapted from Heymons.) ganglia along the median line the middle strand is enclosed, while fibers passing transversely from each ganglion unite with the fibers of the neuro- pile to form the commissures. These, however, are not sharply differ- entiated in Scolopendra. From the mesoderm a peritoneum is developed covering the entire nerve cord. Lateral nerves develop early from each ganglion, becoming elongated when the ganglia migrate toward the center line. The nerve cord, exclusive of the subesophageal ganglion, consists of. 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 Compa
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