Area opaca



the opaque area of the blastoderm surrounding the area pellucida.
Historical Examples

Junction between the white-yolk spheres and the hypoblast cells at the passage from the area pellucida to the area opaca.
The Works of Francis Maitland Balfour, Volume IV (of 4) Francis Maitland Balfour

Towards the end of the first day blood-vessels begin to be developed in the inner part of the mesoblast of the area opaca.
The Works of Francis Maitland Balfour, Volume III (of 4) Francis Maitland Balfour

The area vasculosa also grows round the yolk, and completely encloses it not long after the area opaca.
The Works of Francis Maitland Balfour, Volume III (of 4) Francis Maitland Balfour

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  • Area pellucida

    the translucent central area of the blastoderm of birds and reptiles within which the embryo develops. Historical Examples From the middle of this sickle a process next grows forward into the area pellucida. The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour They are almost entirely confined to the posterior part of the […]

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    anthropological or sociological research intended to gather and relate data on various aspects of a geographical region and its inhabitants, as natural resources, history, language, institutions, or cultural and economic characteristics; a field investigation into human ecology.

  • Area vasculosa

    that part of the area opaca in which the blood cells and vessels are formed. Historical Examples Outside the area pellucida, an area vasculosa has become very well defined. The Works of Francis Maitland Balfour, Volume III (of 4) Francis Maitland Balfour Their development is completed on the second day; and the region through which […]



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