File:HarrisonJeffcoate1953 fig02.jpg
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Fig. 2. A section (number 27) of the anterior end of the embryo
showing the thickening of the endoderm (at a in the figure) bulging into the cavity of the yolk-sac. Since the embryo was cut obliquely, only the disc ectoderm and not the amniotic cavity is seen in this section. Part of the wall of the yolk-sac was torn during histological sectioning (just below the pointer in the figure), and was displaced into the blastocyst cavity. ( x 180.)
Reference
Lewis BV. and Harrison RG. A presomite human embryo showing an early stage of the primitive streak. (1953) J Anat. 87(2):124-9. PMID: 13044724
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