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==Fig. 2. The first section of the primitive streak==


Shown at low magnification (A, X 139), and the third section (B) at a magnification of 320. The streak forms a median downgrowth from the ectoderm of the embryonic plate towards the endoderm and fusing with it. Dorsal to the streak is a shallow primitive groove. In the upper part of A the body stalk can be seen attached to the amniotic duet, which is also clearly visible in B.
===Reference===
{{Ref-LewisHarrison1966}}

Latest revision as of 00:09, 7 August 2017

Fig. 2. The first section of the primitive streak

Shown at low magnification (A, X 139), and the third section (B) at a magnification of 320. The streak forms a median downgrowth from the ectoderm of the embryonic plate towards the endoderm and fusing with it. Dorsal to the streak is a shallow primitive groove. In the upper part of A the body stalk can be seen attached to the amniotic duet, which is also clearly visible in B.

Reference

Lewis BV. and Harrison RG. A presomite human embryo showing a yolk-sac duct. (1966) J Anat. 100(2): 389-96. PMID: 5954785

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