Primitive groove Information & Primitive groove Links at HealthHaven.com

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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

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.

[edit] External links

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

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

Developmental biology > Human embryogenesis (development of embryo) and development of fetus

First three
weeks

Week 1

Fertilization · Egg activation · Zygote · Cleavage · Morula · Blastula (Blastomere) · Blastocyst · Inner cell mass

Week 2
(Bilaminar)

Hypoblast · Epiblast

Week 3
(Trilaminar)

Germ layers	Archenteron/Primitive streak (Primitive pit, Primitive knot/Blastopore, Primitive groove) · Gastrula/Gastrulation · Regional specification

Ectoderm	Surface ectoderm · Neuroectoderm · Somatopleure · Neurulation · Neural crest

Endoderm	Splanchnopleure

Mesoderm	Chorda- · Paraxial (Somite/Somitomere/Sclerotome/Myotome/Dermatome) · Intermediate · Lateral plate (Intraembryonic coelom, Splanchnopleure/Somatopleure)