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26 Cards in this Set

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What is the neuron that directly innervates a muscle?
Lower motor neuron
What are the 2 possible locations of lower motor neuron cell bodies?
Ventral horn of spinal cord
Cranial nerve motor nuclei
Where does the upper motor neuron send input to?
Lower motor neuron
Where is the cell body of an upper motor neuron located?
Cerebral cortex
How does the upper motor neuron synapse with the lower motor neuron?
Directly or through an interneuron
What are all the upper motor neurons as a group called?
Pyramidal motor system
What makes up the basis pedunculi?
Descending myelinated fibers of cortical origin
What are pontine nuclei?
Small clusters of cells scattered throughout the base of the pons
What makes up the middle cerebellar peduncle?
pontocerebellar fibers
Corticospinal fibers are the axons of ------- cells
pyramidal motor
When the corticospinal fibers join in the caudal medulla what structure do they form?
Pyramids
What is the action of the pyramidal motor system?
Fine,skilled volitional movements of the limbs
What neurons (contra/ipsi) control the upper half of the face?
Bilateral
What neurons (contra/ipsi) control the lower half of the face?
Contralateral
What neurons (contra/ipsi) control the hypoglossal nucleus?
Contralateral
---- musculature is (contra/ipsi/bi) innervated by the muscle cortex
axial, bi
What would be the only difference between a lesion at the base of the pons and a lesion in the lateral corticospinal tract?
In the base of the pons, loss of function would occur on the contralateral side. At the lateral corticospinal tract, loss of function would occur on the ipsilateral side.
What are the key symptoms of an acute injury to the pyrimidal motor system?
Weakness or paralysis
hyporeflexive
What are the key symptoms of a chronic injury to the pyrimidal motor system?
Change in muscle tone
Hyperreflexive
Spasticity
Clonus
Loss of dexterity
At the level of the precentral gyrus, what section of the body is represented in the midline of the paracentral lobule?
foot
At the level of the precentral gyrus, what section of the body is represented most laterally, near the lateral fissure?
face
At the level of the precentral gyrus, what 2 sections of the body have a disproportionate representation?
Hands and face
What section of the body is represented by the fibers that pass through the genu of the internal capsule?
Face
What section of the body is represented by the fibers that pass through the posterior limb of the internal capsule?
Foot
What section of the body is represented by the fibers that pass through the medial basis pedunculi?
Face
What section of the body is represented by the fibers that pass through the lateral basis pedunculi?
Foot