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 336 EMBRYOLOGY OF INSECTS AND MYRIAPODS mesoderm follows it by a rapid growth along its lateral margins. When the lateral margins come in contact with the yolk, they are reflected backward and inward toward the median line, thus forming, on either Fig. 291.—Neophylax. Cross section of first abdominal segment, {ect) Ectoderm. (n) Connective of nerve cord. {som. m) Somatic mesoderm, {splm
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 336 EMBRYOLOGY OF INSECTS AND MYRIAPODS mesoderm follows it by a rapid growth along its lateral margins. When the lateral margins come in contact with the yolk, they are reflected backward and inward toward the median line, thus forming, on either Fig. 291.—Neophylax. Cross section of first abdominal segment, {ect) Ectoderm. (n) Connective of nerve cord. {som. m) Somatic mesoderm, {splm) Splanchnic meso- derm, (yc) Yolk cell migrating into the body cavity. Fig. 292.—Neophylax. Sagittal section of embryo, (an) Anus, (malp) Malpighian tubules, (mes) Mesoderm, (spg) Spinning glands, (yc) Yolk cells. side of the body, a mesodermic layer, bounding the yolk on the ventral side. By continued growth the margins finally meet each other (Fig. 291). The inner (splanchnic) layer of mesoderm extends over and encloses the yolk to form the muscle layer of the mid-gut. This occurs before the yolk (entoderm) cells have formed the epithelial lining. The
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