A trilaminar embryonic disc, trilaminary blastoderm, or trilaminar germ disk is an early stage in the development of triploblastic organisms, which include...

the three germ layers of the embryo, so that the bilaminar disc is now a trilaminar disc, the gastrula. The three germ layers are the ectoderm, mesoderm...

approximately nine weeks of gestational age, due to folding of the trilaminar germ disc, the amniotic sac expands and occupy the majority of the volume of...

to define a species as a chordate. The notochord is derived from the embryonic mesoderm and consists of an inner core of vacuolated cells filled with...

extraembryonic mesoderm. Initially it lies caudally to the trilaminar germ disc, but, with subsequent embryonic folding, the body stalk assume a more ventral position...

the definitive ectoderm. The process of gastrulation results in a trilaminar germ disc, consisting of the ectoderm, mesoderm and endoderm layers. Epiblasts...

The neural fold is a structure that arises during neurulation in the embryonic development of both birds and mammals among other organisms. This structure...

with the ventral infolding and the subsequent midline fusion of the trilaminar disc, forms a pair of intraembryonic coeloms anterolaterally around the...