blastoporen
The blastopore is the opening formed during gastrulation in animal embryos that will become part of the digestive tract. It arises as cells of the blastula move inward to form the archenteron, the early gut cavity. The opening at the tip of the archenteron is the blastopore, and its fate varies among major animal groups.
During gastrulation, different cell movements establish the germ layers and rearrange tissues. The blastopore's position and
In amphibians and some other vertebrates, the blastopore lies on the dorsal lip region; this dorsal lip
In many species the blastopore eventually closes as the gut forms, and the archenteron differentiates into