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).
Types of Primitive Reflexes. 1  Moro Reflex: The Moro reflex acts as a babyâs primitive fight/flight reaction and is typically replaced by the adult startle reflex by four months old. 2  Rooting Reflex: The rooting reflex assists in the act of breastfeeding and is activated by stroking a babyâs cheek, causing her to turn and open her mouth.