Fig. 156. Surface views of chick blastoderms
a, Blastoderm with primitive streak and head process; showing blood islands (dark spots in crescent-shaped area in lower part of figure).
b, Blastoderm with 6 pairs of primitive segments. Reticulated appearance is due to blood islands (dark spots) and to developing vessels, the entire reticulated area being the area vasculosa.
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|current||15:08, 18 January 2011||921 × 617 (150 KB)||S8600021||==Fig. 156. Surface views of chick blastoderms== a, Blastoderm with primitive streak and head process; showing blood islands (dark spots in crescent-shaped area in lower part of figure). b, Blastoderm with 6 pairs of primitive segments. Reticulated app|
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