Text book of the Embryology of Invertebrates volume 2
Text book of the Embryology of Invertebrates volume 2
E Eugen Korschelt
The book Text book of the Embryology of Invertebrates volume 2 was written by author E Eugen Korschelt Here you can read free online of Text book of the Embryology of Invertebrates volume 2 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Text book of the Embryology of Invertebrates volume 2 a good or bad book?
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Fig. 50 B and C), the egg dividing up first into two, then into four, eight, and sixteen cleavage-spheres of equal size, which are similarly filled with spherules of yolk. Within each of these cleavage-spheres lies a nucleus surrounded by a star-like mass of protoplasm which sends out numerous processes. The further cleavage proceeds, the more do these separate nuclei approach the surface of the egg. As a consequence of this they lose control of those portions of the now prismatic cleavage-cell...s which stretch inwards. The result is a stage in which cell-regions can be dis- tinguished at the surface divided by furrows, while in the interior of the egg the originally distinct cells have become secondarily fused together (Fig. 50 D). The cleavage has become superficial. At the same time an even sharper distinction between formative and nutritive yolk takes place. The superficial cells finally contain only formative yolk, and become separated from the nutritive yolk by a distinct line. A blastula-stage (Fig.
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