File:LewisHarrison1966 fig02.jpg
From Embryology
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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
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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