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17 Cards in this Set

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