Phylogenetic Subsystems/Stages
The vagus nerve is a primary component of the autonomic nervous system. Polyvagal theory outlines the structure and function of the two distinct branches of the vagus, both of which originate in the medulla. More specifically, each branch is associated with a different adaptive behavioral strategy, both of which are inhibitory in nature via the parasympathetic nervous system (PNS). The vagal system is in opposition to the sympathetic-adrenal system, which is involved in mobilization behaviors. According to polyvagal theory, these opposing systems are phylogenetically arranged.
Read more about this topic: Polyvagal Theory
Famous quotes containing the word stages:
“But parents can be understanding and accept the more difficult stages as necessary times of growth for the child. Parents can appreciate the fact that these phases are not easy for the child to live through either; rapid growth times are hard on a child. Perhaps it’s a small comfort to know that the harder-to-live-with stages do alternate with the calmer times,so parents can count on getting periodic breaks.”
—Saf Lerman (20th century)