All of the following are part of the peripheral nervous system except the somatic nervous system the parasympathetic nervous system the autonomic nervous system the central nervous system

Both types of rubrics

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.