Uberon definition : A tubular passage that extends from the primitive pit into the head process during
the early stages of embryonic development in mammals. It perforates the splanchnopleure
layer so that the yolk sac and the amnion are connected temporarily.;
A tubular passage that extends from the primitive pit into the head process during
the early stages of embryonic development in mammals. It perforates the splanchnopleure
layer so that the yolk sac and the amnion are connected temporarily.