What is a germinal tissue?
A Germinal matrix hemorrhage is a bleeding into the subependymal germinal matrix with or without subsequent rupture into the lateral ventricle. The microcirculation in this particular area is extremely sensitive to hypoxia and changes in perfusion pressure. It is most frequent before 35 weeks gestation and is typically seen in low birth-weight babies.
The germinal disc is located on the yolk, so that is where the initial cellular division takes place. But a chick can not develop with out both the yolk and the whites (albumen). The yolk is a high concentration of fats which provides energy for growth where as the albumen is high in proteins also needed for tissue growth.