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 .«S:'?' ^« \35' â si^iri .m^ Fig. 171.âArchipsocus. Sagittal section of stomodaeum (stom). {br) Brain, (ent) Entoderm, {mes) Mesoderm, (ser) Serosa, (trc) Trophocyte. (ves) Vesicle. state in what manner this is accomplished. The dorsal organ lies above the stomodaeum. Between the dorsal organ and the brain is the remnant of the anterior entodermal mass loosely adherent to the dorsa
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 .«S:'?' ^« \35' â si^iri .m^ Fig. 171.âArchipsocus. Sagittal section of stomodaeum (stom). {br) Brain, (ent) Entoderm, {mes) Mesoderm, (ser) Serosa, (trc) Trophocyte. (ves) Vesicle. state in what manner this is accomplished. The dorsal organ lies above the stomodaeum. Between the dorsal organ and the brain is the remnant of the anterior entodermal mass loosely adherent to the dorsal surface of the stomodaeum. Along the ventral surface of the nutritive mass is the layer of entodermal cells from the middle rudiment. Meanwhile dorsally the entodermal cells in the nutritive mass arrange themselves in a dorsal layer. The nutritive mass is thus gradually enclosed by ento- dermal cells (Fig. 172) with the help of the entodermal cells situated at the tip of the proctodaeum. At this time the mid-gut is attached to the stomodaeum, and internally the mid-gut encloses the anterior entodermal vesicle (Fig. 172, ent. ves) which was derived from the major part of the anterior entodermal rudiment. The vesicle elongates toward the posterior end where it comes in contact with the smaller posterior vesicle, thereby forming a tube. Meanwhile the nutritive mass is
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