Primitive Streak ď ą
ď ą
Near the tail end of the disc, begin to proliferate & form an epiblastic elevation that bulges into the amniotic cavity— Primitive Streak. The primitive streak is at first a rounded swelling but with the elongation of the embryonic disc it becomes linear & lies at the central axis of the disc. Primitive pit surrounded by the elevated Primitive node is located at the cranial end of the primitive streak. Since the cells forming the primitive are leuripotent, their persistence may give rise to tumors containing all the www.indiandentalacademy.com three germ layers. Teratoma