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 p-ssage 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