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 ; section of 45-hour germ band, (ect) layer, (vg) Second ventral groove. Ectoderm, {il) Inner begins to show polyhedral differentiation in the immediate neighborhood of the embryo. By the seventy-fifth hour the entire mass is divided into polyhedral masses, which 24 to 36 hours later completely disappear. Fig. 142.—Locusta. Cross section of hind region of protocerebrum of 42-
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 ; section of 45-hour germ band, (ect) layer, (vg) Second ventral groove. Ectoderm, {il) Inner begins to show polyhedral differentiation in the immediate neighborhood of the embryo. By the seventy-fifth hour the entire mass is divided into polyhedral masses, which 24 to 36 hours later completely disappear. Fig. 142.—Locusta. Cross section of hind region of protocerebrum of 42-hour germ band, (am) Amnion, (am. cav) Amniotic cavity, (ect) Ectoderm, (il) Inner layer. (ser) Serosa, (y) Yolk, (yc) Yolk cell. Not all the cleavage cells reach the egg periphery to form the primary epithelium (blastoderm), some remaining in the yolk to form the vitello- or primar}^ yolk cells, stellate cells with large round nuclei.
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