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17 Cards in this Set
- Front
- Back
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What is the function of the Rubrospinal tract?
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To let the Cerebral cortex and cerebellum indirectly influence motor activity in the spinal cord.
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What does the Rubrospinal tract ultimately excite?
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Flexor muscles in the proximal limb
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Where is the Red nucleus located?
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Within the tegmentum of the midbrain at the level of the superior colliculus.
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What does the Red Nucleus recieve input from?
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-Ipsilateral Cerebral cortex
-Contralateral Cerebellar nuclei |
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How does input from the contralateral cerebellar nuclei get to the red nucleus?
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Via passing through the superior cerebellar peduncle
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Where in the cortex do corticorubral fibers originate?
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-Premotor cortex
-Motor cortex |
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To what 2 sites does the red nucleus project?
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-Spinal cord
-Brainstem nuclei |
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Where does the rubrospinal tract decussate?
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In the Ventral Tegmentum
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Where is the rubrospinal tract within the spinal cord?
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In the lateral brainstem and lateral funiculus; intermingled with the Lateral corticospinal tract
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Where does the Rubrospinal tract terminate?
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on alpha-LMNs and gamma-LMNs
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What are 2 clinical problems of the rubrospinal tract?
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-Decorticate posturing
-Benedikt's Syndrome |
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What causes decorticate posturing?
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Injury to the cerebral cortex or internal capsule
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What does the patient exhibit if they have Decorticate posturing?
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-Upper limbs lflexed at the elbow and clamped to sides
-Lower limbs extended |
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What is intact and what is not intact in Decorticate posturing?
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-Corticospinal tract is NOT intact; cortex input eliminated
-Rubrospinal tract IS intact; cerebellar input still there |
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What is the problem in Benedikt's syndrome?
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Unilateral lesion of the red nucleus
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2 symptoms of Benedikt's syndrome:
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-Ipsilateral oculomotor palsy
-Contralateral tremor |
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Is a rubrospinal tract lesion usually isolated?
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No; often seen in conjunction with corticospinal tract lesions.
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