#reticular_activating_system__RAS  the network in the reticular formation that serves an alerting or arousal function
  part of:  #reticular_formation
  supertype:  #neural_network__neural_net  any network of neurons or nuclei that function together to perform some function in the body
     supertype:  #reticulum  any fine network (especially one in the body composed of cells or blood vessels)
        supertype:  #network.system__web  an intricately connected system of things or people; "a network of spies"; "a web of intrigue"
           supertype:  #system  a group of independent but interrelated elements comprising a unified whole; "a vast system of production and distribution and consumption keep the country going"
              supertype:  #group__grouping  any number of entities (members) considered as a unit
                 supertype:  pm#collection  something gathering separated things (entities/situations)
                    supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
                       supertype:  pm#entity  something that can be "involved" in a situation
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                       supertype:  pm#divisible_thing__divisiblething
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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