Definitions for gastrulaˈgæs trʊ lə; -ˌli
Random House Webster's College Dictionary
gas•tru•laˈgæs trʊ lə; -ˌli(n.)(pl.)-las, -lae
an embryo in an early stage of development during which the blastula differentiates into two cell layers and the central cavity becomes the archenteron.
Category: Developmental Biology
Origin of gastrula:
double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
A stage in the development of embryos of most animals consisting of a two-layered sac of ectoderm and endoderm.
an embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastraea
of or pertaining to a gastrula
U.S. National Library of Medicine
The developmental stage that follows BLASTULA. It is characterized by the morphogenetic cell movements including invagination, ingression, and involution. Gastrulation begins with the formation of the PRIMITIVE STREAK, and ends with the formation of three GERM LAYERS, the body plan of the mature organism.