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23 Cards in this Set
- Front
- Back
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What are the three components of cortical motor control?
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1. Goal of movement
2. Plan of action 3. Execution of plan |
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What areas of the cortex are involved with planning and execution of movement?
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-Primary motor area (4)
-Supplementary motor area (6-medial) -Premotor area (6-lateral) -Posterior parietal cortex (5, 7) -Limbic structures |
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What Brodmann's area is the primary motor area in?
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Area 4
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What Brodmann's area is the supplementary motor area in?
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Area 6-medial surface
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What Brodmann's area is the premotor area in?
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Area 6-lateral surface
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What Brodmann's area is the posterior parietal cortex in?
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Areas 5, 7
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Where does the primary motor area receive afferents from?
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SI (areas 3, 2, 1)
Area 6 Area 5 |
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Where do efferents from the primary motor area travel?
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-Through pyramidal tract pathways from area 4 to spinal cord (some monosynaptic onto motor neurons of spinal cord)
-Corticofugal pathways (area 4 to brainstem nuclei) -Monosynaptic connections onto motor neurons that control distal muscles |
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When do cells in the primary motor area become active?
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Just prior to movement
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Are there neurons in the primary motor cortex for precision grip or forceful grip?
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Both
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Are neurons in the primary motor cortex active for specific or vague movements?
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Specific
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Where does the supplementary motor area receive afferents from?
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Areas 5 and 7
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Where do efferents from the supplementary motor area travel?
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To the brainstem and spinal cord, but most to the primary motor area
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What is the supplementary motor are involved in?
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Complex movements
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Where does the premotor area receive afferents from?
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Area 7 (visual information that is used in goal-directed movement)
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Where do efferents from the premotor cortex travel?
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To the brainstem nuclei and primary motor cortex
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What is the function of the premotor area?
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It is important in control of visually guided movements
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Area 5 is part of what area? What information does it process?
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Posterior parietal area; processes sensory information from somatosensory cortex
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Area 7 is part of what larger are? What information does it process?
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Posterior parietal area; processes information from visual cortical areas
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Lesions of the supplementary, premotor or posterior parietal cortices result in what deficits?
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Difficulty planning complex movements that require the use of somatosensory and visual information to perform a task
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An SMA lesion results in what deficits?
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Inability to formulate a plan to use one hand to push a morsel of food so it can be caught by the contralateral hand
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What is apraxia?
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The inability to motor plan
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What are the limbic structures involved in?
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Motivation to perform and attention to attend to motor tasks
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