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).
During the solid stage of development the endoderm of the gut tube proliferates until the gut is a solid tube. A process of recanalization restores the lumen. Proctodeum and Stomodeum The proctodeum (anal pit) is the primordial anus, and the stomodeum is the primordial mouth.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.