Flashcards in L06 Motor Pathways Deck (38)
is the lower motor neuron body in the CNS or PNS?
is the axon of the LMN in the CNS or PNS?
name 4 major inputs from the CNS that a LMN receives input from?
cerebral cortex (major)
which side do LMNs innervate?
where are the LMNs in the spinal cord?
where are the LMNs in the brainstem?
discrete nuclei that form the bodies of the cranial nerves
a patient presents with hyporeflexia. where is the lesion?
a patient presents with hyperreflexia. where is the lesion?
biceps tendon spinal segment innervation?
triceps tendon spinal segment innervation?
patellar tendon spinal segment innervation?
achilles tendon spinal segment innervation?
name symptoms of LMN lesions
atrophy (lack of tropins from nerves)
fasciculations (early onset)
role of the vestibulospinal tract?
role of the reticulospinal tract?
role of the rubrospinal tract?
upper limb flexors
role of the corticospinal tract?
voluntary control of skeletal muscle
UMNs are modulated by which parts of the brain?
basal nuclei and cerebellum, via thalamus.
function of the lateral corticospinal tract?
skilled asymmetric limb movement
where do axons of the UMNs in the corticospinal tract synapse?
in the lower cervical and lumbosacral enlargements. innervate distal limb musculature for fine motor skills.
name the path of an UMN from cortex to spinal cord
decussation of the pyramids
lateral corticospinal tract in lateral column
name symptoms of UMN lesions
contralateral hemiplegia if in brain, ipsilateral if in spinal cord.
positive babinski's sign
lesion in CN IV nucleus affects which side?
lesion in CN IV nerve affects which side?
lesion in cranial nerve nuclei affects which side?
ipsilateral (except IV)
babinski's sign tests for what?
the corticobulbar tract includes motor for which cranial nerves?
V, VII, IX, X, XI, XII
which cranial nerves in the corticobulbar tract are controlled bilaterally?
V, IX, X
effect of unilateral LMN lesion in the masticator nucleus (V3)?
weakness in muscles of mastication