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).
When we talk about primitive man, we're usually talking about cavemen and other people who existed before the advent of table manners, but if your uncle speaks grunts and chews with his mouth open, you could describe him as primitive too. Primitive is related to the word prime, and the root of both words is primus, which is Latin for first.. Since the phrase primitive man refers to the world's first people, you might think that the word primate has something to do with the similarity between early humans and monkeys, but it doesn't.