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 gut tube is formed as the spherical yolk sac is compressed by the transverse folding or bending of the embryo. The straight, endodermal gut tube can be divided caudal to the diaphragm into the abdominal foregut, midgut, and hindgut. Note that the derivatives of the foregut continue cranial to the diaphragm and include the esophagus and the pharynx.