Neuro Review 8

Where are UMNs located?

• the brain stem

• the spinal cord

• the cortex

• both A and C

If a patient has weakness in their lower muscles of facial expression, this is a LMN dysfunction

• True

• False

The majority of fibers in the Corticospinal tract cross and become the lateral cotricospinal tract

• True

• False

The Anterior Corticospinal tract projects bilaterally and plays a part in . . .

• skilled limb movement

• muscles in facial expression

• oral motor cavity control

• postural control

A lesion in the corticospinal tract above the motor decussation would present as . . .

• ipsilateral motor deficits

• contralateral motor deficits

• bilateral LE deficits

• contralateral and ipsilateral deficits

LMN that innervate the trapezius receive . . .

• ipsilateral input

• contralateral input

• bilateral input

• contralateral and ipsilateral deficits

What kinds of neurons are contained in the output zone of the basal nuclei and what type of neurotransmitter do they secrete?

• multipolar

  neurons; glutamate

• medium spiny neurons; GABA

• multipolar

  neurons; GABA

• medium spiny neurons; glutamate

Which of the following describes the indirect pathway of the basal nuclei?

• Disinhibition of the thalamic and superior colliculi neurons allowing UMNs to

  send motor commands to lower centers

• Enhanced inhibition of the thalamic and superior colliculi neurons preventing

  UMNs from sending motor commands to lower centers

You want to reach for a cup of water, which of the following will suppress the tonically active globus pallidus to allow you to do so

• Decreased inhibition from the putamen

• Decreased inhibition from the caudate

• Increased inhibition from the putamen

• Increased inhibition from the caudate

True or False: The dopaminergic circuit excites the direct pathway and inhibits the indirect pathway

• True

• False