restriction. n. 1. something that restricts; a restrictive measure, law, etc. 2. the act of restricting or the state of being restricted. 3. (Logic) logic maths a condition that imposes a constraint on the possible values of a variable or on the domain of arguments of a function.
The primitive gut that forms during gastrulation in the developing embryo is known as the archenteron or the digestive tube.It develops into the digestive tract of an animal.ach is controlled by the dorsal blastopore, and primitive node (also known as Hensen's node), respectively. During Gastrulation, the Archenteron develops into the digestive tube, with the blastopore developing into either the mouth (Protostome) or the anus (Deuterostome).
Without the primitive streak, the round bilaminar disc would never become an elongated oval, the 3 germ layers would not be created and there would be no generation of organs or organs would be generated in an uncompartmentalized body without symmetry. Organs all over the place. Explanation: Eventually, the primitive streak is supposed to diminish in relative size and become an insignificant structure in the sacrococcygeal region of the embryo Normally, the primitive streak undergoes degenerative changes and disappears by the end of the fourth week.