1e Motor 1&2 UMNs

Question 1

What does the Rubrospinal Tract do?

Answer 1

from red nucleus to upper limbs; targets flexors over extensors (contributes to Decorticate Rigidity), controlled by cerebellar output

Question 2

What does the Vestibulospinal Tract do?

Answer 2

medial & lateral tracts, primarily proximal extensors

Question 3

What do Corticobulbar (corticonuclear) Fibers do?

Answer 3

from cortex to innervate certain CN motor nuclei

Question 4

What structures have influence on UMNs?

Answer 4

cerebellum, association cortex, basal ganglia

Question 5

What are Lateral tracts/pathways associated with?

Answer 5

limb muscle movement (distal)

Question 6

What are Medial tracts/pathways associated with?

Answer 6

axial (trunk) muscle movement (proximal)

Question 7

What are the Lateral Tracts?

Answer 7

Lateral Corticospinal, Rubrospinal

Question 8

What are the Medial Tracts?

Answer 8

Anterior Corticospinal, Vestibulospinal, Reticulospinal

Question 9

What is the Rubrospinal Tract responsible for?

Answer 9

distal upper extremity musculature (prefers flexors over extensors)

Question 10

How does the Lateral Corticospinal tract differ from the Anterior (medial) Corticospinal Tract?

Answer 10

lateral corticospinal tracts are fibers that have crossed over; anterior corticospinal fibers remain ipsilateral

Question 11

What is the Vestibulospinal Tract responsible for?

Answer 11

extensors over flexors, axial over distal musculature

Question 12

What is the Reticulospinal Tract responsible for?

Answer 12

axial/medial over distal musculature, one portion targets extensors, other targets flexors