Contributions to Embryology, Vol. 4: Nos. 10, 11, 12, 13 (Classic Reprint) - Tapa dura

Excerpt from Contributions to Embryology, Vol. 4: Nos. 10, 11, 12, 13

It is, however, not quite clear how the cavity traversed by scattered strands of mesoblast and lying between the yolk-sae and the chorion in the Peters ovum is to be interpreted. It may be sup posed to represent the extraembryonic coelom; but it may also be imagined that it has arisen from an extensive loosening up of the tissue, and not by a splitting of the mesoderm, and that the triangular space between the caudal extremity of the embryo, which is lined with flat cells having an epithelial arrangement, is the first primordium of the coelom.

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