File:Sections of the blastoderm, and embryo Wellcome M0016965.jpg

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Sections of the blastoderm, and embryo
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Sections of the blastoderm, and embryo
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Fig. 8A, 1 and 2.—Elements of the blastoderm of four days.

Fig 8A, 3, 4, and 5—Elements of the blastoderm of seven days.

Fig 8a and b.—Elements of the blastoderm of ten days.

Fig 9—Vertical section through the blastoderm of three days. a, blastoderm. b, yolk of the saucer-like depression.

Fig 10.—Vertical section through the blastoderm of six days. «, blastoderm. b, yolk. e, fut-globules of the same.

Fig 11.—Vertical section through the blastoderm of twelve days. a, blastoderm. b, segmentation cavity. c, large elements on the bottom of the cavity. d, superficial layer of flattened cells of the blastoderm. e, yolk.

Fig 12.—Vertical section through a blastoderm of fourteen days. a, segmentation cavity. 6, peripheral swelling of the blastoderm. cc, superficial layer of flattened cells of the blastoderm. d, lower layer of cells of the thinner part of the blastoderm. e, large elements on the bottom of the cavity. 7, yolk. 4g, fat-globules of the yolk.

Fig 13.—Vertical section through the embryo of eighteen days. a, superficial or corneous layer. b. second or nervous layer. c, third or motoric-germinative layer (middle layer). d, lower or epithelio-glandular layer. e, yolk. f, central nervous system. g, chorda dorsalis.

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Keywords: Embryology
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