ventral plate n.
See floor plate.
Amnion cavity: a tube-like insinking from the ventral plate of the embryo, extending cephalad.
By an unequal growth of the ventral plate the primitive cumulus comes to be placed at the cephalic pole of the ventral plate.
At the posterior part of the ventral plate two folds, with a furrow between them, make their appearance.
The cells of the ventral plate are now divided into two distinct layers.
The mesoblast in the Tracheata is formed in connection with a median thickening of the ventral plate.
The epiblast of the ventral plate has not, to any great extent, altered in constitution.
The mesoblast is formed as an unpaired plate split off from the epiblast of the ventral plate.
The blastoderm becomes thickened on the ventral surface, and so forms a ventral plate.
The mesoblast in both groups is formed by a thickening of the median line of the ventral plate (germinal streak).
The folds eventually meet, coalesce (fig. 178, am) and give rise to two membranes covering the ventral plate, viz.