RAS (A+ GUARANTEED)

what do the RAS do with most of the stimuli? correct answers it filters though it where is the RAS located? correct answers in the mid ventral portion of the brainstem and the medulla where does the net of the RAS extend ? correct answers from the spinal cord to the cortex what are the 4 functions of the reticular formation? correct answers 1) skeletal muscle activity 2) somatic and visceral sensations 3) autonomic and endocrine systems 4) levels of consciousness (RAS) what are the 2 components of the reticular formation? correct answers 1) the descending 2) the ascending what is the descend ret formation important for? correct answers its involved in posture and equilibrium as wells as autonomic nervous system activate where does the descending ret form receive info from? correct answers the hypothalamus what is the importance of the ascending ret form? correct answers its responsible for the sleep wake cycle - it projects to the midline group of the thalamus, then info is sent to the cortex. what is RAS? (2) correct answers a complex postsynaptic pathway -responsible for regulating sleep wake cycle and level of consciousness where does the ras pass? correct answers part of it bypasses the thalamus, but most go straight to it. what are the 2 types of signals passing through the thalamus? correct answers 1) rapidly transmitted action potentials ( use ACh) 2) slowly transmitted APs ( synapse in *intralaminar nuclei* of thalamus and *reticular nuclei*) - excitatory effect can build up over seconds or minutes- important for controlling longterm background excitability of the brain) what are the 5 levels of consciousness correct answers 1) alert ( response fully) 2) lethargy ( response to verbal) 3)obtunded ( responds to touch) 4) stupor ( responds to pain) 5) coma ( no response) what are the two types of sleep that alternate with eachother? correct answers 1) slow wave sleep