Primitive groove

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Primitive groove
Surface view of embryo of Hylobates concolor. The amnion has been opened to expose the embryonic disk.
Latin sulcus primitivus
Gray's p.47
Carnegie stage 9

A shallow groove, the primitive groove, appears on the surface of the primitive streak, and the anterior end of this groove communicates by means of an aperture, the blastophore, with the yolk-sac.

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This article incorporates text from a public domain edition of Gray's Anatomy.