Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 384 EMBRYOLOGY OF INSECTS AND MYRIAPODS ventral surface of the egg which become lodged on the yolk surface. At first they are indistinguishable from the yolk cells. Soon more cells are liberated from the cumulus primitivus and from its vicinity. These represent mesoderm or mesenchyme cells. Yolk cells and entoderm cells probably arise chiefly from the ventral side of the egg. The relati

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Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 384 EMBRYOLOGY OF INSECTS AND MYRIAPODS ventral surface of the egg which become lodged on the yolk surface. At first they are indistinguishable from the yolk cells. Soon more cells are liberated from the cumulus primitivus and from its vicinity. These represent mesoderm or mesenchyme cells. Yolk cells and entoderm cells probably arise chiefly from the ventral side of the egg. The relatively few cells liberated from the inner dorsal side of the egg are probably mainly or exclusively mesenchyme (mesoderm) cells. The germ disk represents the posterior part of the future germ band. The heap of cells (Fig. 339) that at first developed on the inner side of the mes mes

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