Elements of histology / by E. Klein.

  • Edward Emanuel Klein
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.

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    fact, its size is in proportion to its state of develop- ment. causes marked changes in the contractions of the protoplasm of the ovum; these Fig. 2.—From a Section through the Blastoderm of Chick, unincubated. a. Cells forming the ectoderm ; h, cells forming the endoderm ; c, large formative cells; /, segmentation cavitj'. (Handbook,) lead to cleavage or division of its body into two parts, the germinal vesicle having previously split up into two bodies or nuclei; so that we now find the ovum Fig ;a.—From a Section through, the Eudiment of the Embryo Chick. Primitive groove ; /, dorsal laminge of epiblast; d, mesoblast. The thin layer of spindle-shaped cells is the hypoblast. (Handbook.) has originated two new elements, each of which con- sists of protoplasm, of the same substance as that of the original ovum, and each contains one nucleus or kernel. The investment of the ovum takes no part in
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