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.

External links

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

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

Developmental biology > Human embryogenesis (development of embryo) and development of fetus (TE E2.0)

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	Chorda- Paraxial (Somite/Somitomere) Intermediate Lateral plate Intraembryonic coelom Splanchnopleuric mesenchyme/Somatopleuric mesenchyme

M: OBS

phys/devp/memb

mthr/fetu/infc, epon

proc, drug (2A/G2C)

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