Gastrula
Synonyms
Archenteron
Archenterons
Blastopore
Blastopores
Gastrocoele
Gastrocoeles
Gastrulas
Gut, Primitive
Guts, Primitive
Primitive Gut
Primitive Guts
The developmental stage that follows BLASTULA or BLASTOCYST. 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.