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Related Flashcards
Cards In This Set
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What device can measure motor function in the brain?
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MRI (Magnetic Resonance Imaging)
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How are functional areas of the human cerebral cortex determines?
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By electrical stimulation of the cortex during neurosurgical operations & by neurological examination of patients with destroyed cortical regions.
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SKIP
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SKIP
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What are the 3 types of Neurons?
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1. Granular (Stellate, Interneurons) 2. Fusiform (Efferent)3. Pyramidal (Efferent)
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Cerebral Control of Motor Function
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Layer IV: Incoming Signal comes here
Layer V (BStem & SPC) & IV (Thalamus): Output Signal leaves from here Layer I, II, & III perform most of the intracortical assoc. functions. |
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Broca's Area
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Word Formation. Controls speech.
When Damaged: Impossible to speak whole words |
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Neuronal Tract
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Axons of different neurons coming together and forming a tract
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Where do the fibers from the pyramidal cells have to cross-over to reach the spinal tract?
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Medualla Oblongata
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Internal Capsule
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In the pons, medulla, & thalamus
Has a lot of blood supply; tumors can grow here Can affect the transduction of neuronal message |
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What 3 structures receive strong motor signals from the corticospinal system every time a signal is transmitted down the SC to cause a motor activity?
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1. Basal Ganglia2. Brain Stem3. Cerebrum
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Motor Cortex
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Initiates most voluntary movements
Controlled by nerve signals from the somatosensory system Operates in assoc. w/ the basal ganglia & cerebellum to excite to an appropriate course of motor action. |
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What are the 3 divisions of the motor cortex?
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1. Primary Motor Cortex 2. Premotor Area3. Supplementary Motor Area
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Pyramidal System (Aka- Corticospinal Tract)
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Leaves the cortex, the fibers pass through the internal capsule.
Then, down towards the brain stem forming the pyramids of the medulla. Fibers cross over in the medulla and then reach the spinal cord. |
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Functions of the Motor Cortex
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1. Sends sequential (One at a time) & Parallel (All together) commands.
2. Changes intensities or modifies the timings. 3. Bypasses cord patterns, replaces them with higher-level patterns from the brain stem or cortex. 4. Cortical Pattern: complex, "learned" Cord Pattern: heredity, "hard wired" |
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Wenicke's Area
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Important for Language Comprehension
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