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).
The primitive gut tube is derived from the dorsal part of the yolk sac, which is incorporated into the body of the embryo during folding of the embryo during the fourth week.uodenum. The duodenum acquires its C-shaped loop as the stomach rotates. Because of its location at the junction of the foregut and the midgut, branches of both the celiac trunk and the superior mesenteric artery supply the duodenum.