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.
Gray's subject #6 47
Carnegie stage 9
Dorlands/Elsevier g_12/12402766

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 was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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