Primitive groove

Primitive groove
Surface view of embryo of Hylobates concolor. The amnion has been opened to expose the embryonic disk.
Details
Carnegie stage	9
Latin	sulcus primitivus
*Anatomical terminology* [edit on Wikidata]

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.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

Swiss embryology (from UL, UB, and UF) hdisqueembry/triderm02

Human embryogenesis in the first three weeks

Week 1

Week 2
(Bilaminar)

Week 3
(Trilaminar)

Germ layers	Archenteron/Primitive streak Primitive pit Primitive knot/Blastopore Primitive groove Gastrula Gastrulation Regional specification Embryonic disc

Ectoderm	Surface ectoderm Neuroectoderm Somatopleuric mesenchyme Neurulation Neural crest

Endoderm	Splanchnopleuric mesenchyme

Mesoderm	Axial mesoderm Paraxial Somite Somitomere Intermediate Lateral plate Intraembryonic coelom Splanchnopleuric mesenchyme Somatopleuric mesenchyme

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