Primordial germ cell is derived from:
A i.e. EctodermPrimordial germ cell develops from epiblast (primitive or primary or embryonic ectoderm)Q at the caudal end of primitive streak in the caudal end of embryo. In the 3rd week, primordial germ cells migrate to a mass of extra embryonic mesoderm and then into the endoderm of yolk sac wall.
Ectoderm
Mesoderm
Endoderm
Mesodermal sinus