Reticular activating system Flashcards
State of patient’s awareness of self and
environment and his responsiveness to
external stimulation and inner need
consciousness
arousability:RAS
responsiveness:
cerebral cortex
excitatory areas
mesencephalon
pons
inhibitory areas
medulla
the thalamus is the relay center of almost all
sensory input
the ascending reticular activating system receives fibers from ________ via long __________ tracts
sensory pathways; ascending spinal
lesions below the brainstem will not really produce unconsciousness due to
other input available through trigeminal nerve
lesions within and above the bs would result to
unconsciousness
locus coeruleus
norepinephrine system
substantia nigra
dopamine system
raphe nucleus
serotonin system
gigantocellular neurons of reticular excitatory area
acetylcholine system
