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Cerebellum and functional brain systems

Terms in this set (19)

posterior to the brainstem
Where is the cerebellum loacated?
it has 2 hemispheres like the cerebrum with grey matter on the outside with white matter underneath
How is the cerebellum organized?
arbor vitae
white matter "three olf life
folia
small convolutions on the surface "leaves"
subconscious motor function, balance, coordination, posture, and is the comparator
What functions does the cerebellum serve?
makes decision on how to get where you want to go, compares your present location to desired location, make decisions, decides how to go from present to desired location so movements are coordinated and you can maintain good balance and posture, decides forces direction and degree of muscle contraction to get desired location
what makes the cerebellum a comparator?
ataxia
What happens when the cerebellum is damaged?
uncoordinated movement staggering gait, slurred speech
What is ataxia
the cerebellum
What does a field sobriety test the function of
functional brain system
interconnected neuron that span a large area of the brain, that work together to carry out a specific function
reticular activating system
interconnected neurons in the medulla, pons, midbrain, thalamus, cerebrum and spinal cord
level of alertness by regulating how much info reaches cerebral cortex
What toes the RAS regulate
increased
if there is more info to cerebral cortex is there increased or decreased alertness
regulating level of alertness, filter out unimportant information, sleep, awakeness
What are some of the important functions of the RAS
RAS neurons inhibits by serotonin, melatonin, adenosine, alcohol, sleep meds, -> generate iPSP -> further from threshold fewer impulses conducted by RAS neurons
less into fo cerebral cortex -> decrease activity in CC and induces sleep
Process that induce sleep in RAS
RAS is excites and stimulated by a number of things ( lights sound, touch, etc) generate EPSP (graded depolarization), closer to threshold, more impulses generated -> increases activity in cerebral cortex
Process that induces awakeness in the RAS
lymbic system
emotional brain, interconnected neurons in the medial aspect of the cerebellum, thalamus, hypothalamus, and epithalamus; encircles the brain stem
cingulate gyrus, hippocampus and amygdala
What are the areas of the cerebrum
visceral
emotional is also involved with water motor information
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