Corticospinal
contralateral symtoms
Where does the corticobulbar tract provide information? What type of information does it provide?
face and neck; efferent motor signals
What type of information do the extrapyramidal tracts supply?
involuntary movement
hypertonia, hyperreflexia, positive babinki/clonus, spasticity
Damage to the lateral funiculus will cause what type of symptoms?
ipsilateral symptoms
What is the insurance policy of the corticobulbar tract? Which nuclei are the exceptions?
Bilateral innervation; facial and hypoglossal
what are the 4 EP tracts?
reticulospinal, rubrospinal, tectospinal, and vestibulospinal
explain the corticospinal tract
cortex, corona radiata, internal capsule, cerebral peduncle, pontine nuclei, open medulla, pyramidal decussation, lateral or anterior tract
Innervate muscles of the extremities to produce voluntary movement
What does the corticobulbar tract do?
What is the net influence of the EP tracts on our body?
They keep our body upright against gravity
Explain the route corticobulbar tract
originates in the cortex, travels down in line with corticospinal, passes through internal capsule and bilaterally innervates each facial nuclei
if the damage occurs in the lateral funiculus of the spinal cord, what type of lesion is it considered?
UMN lesion
Where is the lesion located if the pt presents with a L lower face drop?
Right cortex
if there is damage above the red nucleus/superior mesencephalon, what will happen?
Decorticate posture
Where do the anterior fibers of the CS tract decussate?
at the spinal level of innervation
Where will the symptoms appear if there is damage to the corticobulbar tract in the open medulla?
no where! trick question, the corticobulbar tract isn't travel in the open medulla (it leaves at the pons)
Where do the EP tracts live?
in the reticular formation
demonstrate decerebrate posture
...