A Text-Book of Histology, Including Microscopic Technic
The book A Text-Book of Histology, Including Microscopic Technic was written by author Böhm, Alexander A., 1912- Here you can read free online of A Text-Book of Histology, Including Microscopic Technic book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text-Book of Histology, Including Microscopic Technic a good or bad book?
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Retzius believes that the zona pellucida is derived from the processes of the cells composing the corona radiata, which at first interlace and form a network around the ovum. Later, the matrix of the membrane is deposited in the meshes of the network, very probably by the egg itself. Further developmental changes are, however, necessary before a fully developed ovum (ripe ovum) may be fertilized. These are grouped under the head of maturation of the ovum. They have in part been described in a f...ormer section (p. 71), but may receive further consideration at this time. During maturation the chromo- somes are reduced in number, so that the matured ovum presents only half the number found in a somatic cell of the same animal. The manner in which this reduction takes place has been described for many invertebrates and vertebrates, and in all ova studied with reference to this point essentially the same phenomena have been observed. In this account we shall follow the process as it occurs in the Copepoda (Rückert, 94).
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