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Psychology (1,281)
01:830:310 (162)
Lecture 19

01:830:310 Lecture 19: Lecture 19 - Motor Disorders.doc

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Professor Mayhew

- Motor cortex decides what it wants to do (flow chart) - How does it get from prim. motor cortex to muscle o Has motor control tracts (pyramidal tracts) within the spinal cord from the brain o Corticobulbar tracts – controls the facial muscles, nuclei in the pons and the medulla (primary motor cortex  pons and medulla  facial muscles; don’t go very far o Corticospinal tracts – 2 (but not really 2), lateral or medial  Biggest one: lateral  has most of motor control, controls arms and legs  Decussates in the medulla mostly (not exclusively  Medial controls the trunk (shoulders and the neck), helps us to be stabilized in certain positions, less muscles than in arms and eggs o Cranial 12 – controls some of the tongue o Cranial 11 – controls some of the neck movement Motor disorders - either by cortical injuries or subcortical injuries o Big motor disorders are usually subcortical Frontal Lobe - Loose bits of motor skill depending on which area is disturbed - Eye gaze – area 8, matter for allowing us to voluntary direct our eyes where we want to look (attention o Test the problems by asking people to looks for 3 of the same object, direct gaze fairly carefully to get through the whole set o People with slight stroke or damage in the eye fields in area 8 take longer to find 2 similar objects o Natural inclination is to flick eye to moving object, people with frontal area 8 damage will have problems looking away from the moving object when told to, take much longer Corollary discharge – knowing when you are moving relative to your surroundings, make the world “shift” o Cortices get copied, if we are moving, we know that the world will shift Speech - muscle control of mouth and tongue, - movement selection – we generate words in response to something o React to what we see – external stimuli o Conveying something to someone else – internal stimuli - Broca’s area – a speech zone o words based on external stimuli, action words  Damage here – people have problem with verbs o Deals with grammar of the sentence  Agrammatism – problem with grammar - Suppplementary area of primary motor cortex o Has to do with word finding, internal stimuli o Mutism - occurs when there is damage here Subcortical Motor Disorders - cerebellar o Deals with balance, coordinated movement, and planning movement/timing movement (cognitive) o Damage causes:
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