Primitive groove
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.
| Primitive groove | |
|---|---|
 Surface view of embryo of Hylobates concolor. The amnion has been opened to expose the embryonic disk. | |
| Details | |
| Carnegie stage | 9 |
| Identifiers | |
| Latin | sulcus primitivus |
| Anatomical terminology | |
References
This article incorporates text in the public domain from page 47 of the 20th edition of Gray's Anatomy (1918)
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