. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. MY Rl APOD A 395 deeply into the multilayered ectoderm to become the middle-strand nerve cells (Fig. 351, mst). (This section is taken tangent to the pit which therefore does not show.) The middle-strand nerve cells later form a band that connects with the membrana ventralis (Fig. 348, mst). The overgrowth of the ganglia by the epidermis, their separation from it, and the subsequent contraction of the middl
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. MY Rl APOD A 395 deeply into the multilayered ectoderm to become the middle-strand nerve cells (Fig. 351, mst). (This section is taken tangent to the pit which therefore does not show.) The middle-strand nerve cells later form a band that connects with the membrana ventralis (Fig. 348, mst). The overgrowth of the ganglia by the epidermis, their separation from it, and the subsequent contraction of the middle-strand nerve-cell band result in bringing the right and left ganglion toward the median line where they mes mes mst. 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. 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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