File:Amphioxus presumptive organ-forming areas in the uncleaved egg and durmg cleavage and blastulation.jpg

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Description Fig 167 Presumptive organ-forming areas in the uncleaved egg and durmg cleavage and blastulation in Amphioxus. (Original diagram based upon data obtained from Conklin '32 '33.) (A) Uncleaved egg. (B) Eight-cell stage. (C) Early blastula in section (D) Late blastula in section. (E) Late blastula, external view from side. (F) Late blastula, external, vegetal pole view. (G) Late blastula, external, dorsoposterior view. The localization of cytoplasmic materials in Styela partita is similar to that of Amphioxus. Observe that the pointed end of the arrow defines the future cephalic end of the embryo. The position of the polar body denotes the antero-ventral area, while the position of the notochordal and neural plate material represents the antero-dorsal region. The "tail end" of the arrow is the postero-ventral area of the embryo.
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Source https://archive.org/details/comparativeembry00nels/page/335/mode/1up?view=theater&q=BLASTULATION+ Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illustrations.
Author Nelsen, Olin E.

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current20:41, 11 March 2024Thumbnail for version as of 20:41, 11 March 20241,532 × 1,899 (1.91 MB)Rasbak (talk | contribs){{Information |description=Fig 167 Presumptive organ-forming areas in the uncleaved egg and durmg cleavage and blastulation in Amphioxus. (Original diagram based upon data obtained from Conklin '32 '33.) (A) Uncleaved egg. (B) Eight-cell stage. (C) Early blastula in section (D) Late blastula in section. (E) Late blastula, external view from side. (F) Late blastula, external, vegetal pole view. (G) Late blastula, external, dorsoposterior view. The localization of cytoplasmic materials in Styel...

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