Upload-P431-Chapter 9 - Chapter 9: Motor systems Chapter I....

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Unformatted text preview: Chapter 9: Motor systems Chapter I. II. III. IV. V. The spinal cord The descending motor pathways The motor cortex The basal ganglia The cerebellum I. The spinal cord I. Dorsal horns and dorsal funiculi: sensory. Ventral horns and intermediate zones, lateral Ventral and ventral funiculi: motor. and II. The dscending motor pathways II. A. The dorsolateral corticospinal tract. B. The dorsolateral corticorubrospinal tract. C. The ventromedial corticospinal tract. D. The ventromedial cortico-brainstem-spinal The tract. tract. III. The motor cortex III. Primary motor cortex: Primary lies on the precentral gyrus, receives inputs from the frontal association cortex primarily. cortex IV. The basal ganglia IV. caudate nucleus, putamen, globus pallidus. A. Parkinson’s disease: Degeneration of the dopaminergic pathway Degeneration from the substantial nigra to the caudate nucleus and putamen. nucleus Slowness of movement and difficulty in Slowness stopping one behavior and starting another, and resting tremor. and No dementia. B. Huntington’s chorea B. Degeneration of the caudate nucleus and Degeneration putamen, especially of GABAergic and acetylcholinergic neurons. acetylcholinergic Jerky limb movements. Associated with dementia. Hereditary, caused by a dominant gene on Hereditary, chromosome 4. chromosome V. The cerebellum V. Modify the ongoing movement, especially Modify rapid movements. rapid ...
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