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 area pellucida, and give rise to the opacity of that part.
The Works of Francis Maitland Balfour, Volume III (of 4) Francis Maitland Balfour

Section through anterior part of area pellucida in front of embryonic shield.
The Works of Francis Maitland Balfour, Volume IV (of 4) Francis Maitland Balfour

In the course of further growth the area pellucida soon becomes pyriform, the narrower extremity being the posterior.
The Works of Francis Maitland Balfour, Volume III (of 4) Francis Maitland Balfour

The primitive streak is however the most interesting structure in the area pellucida at this stage.
The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour

The epiblast spreads rapidly over the white yolk, and the area pellucida also increases in size.
The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour

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

In the region of the area pellucida there is placed below the epiblast a more or less irregular layer of cells.
The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour

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

In surface views the primitive streak often appears to stop short of the hinder border of the area pellucida.
The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour

Tagged:

Read Also:

  • Area rug

    a rug designed to cover only part of a floor.

  • Area study

    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 […]

  • Area vitellina

    the nonvascular part of the area opaca surrounding the area vasculosa.



Disclaimer: Area pellucida definition / meaning should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. All content on this website is for informational purposes only.