Understanding the Indirect Pathway of the Basal Ganglia

What is the primary function of the indirect pathway in the basal ganglia?

• To increase sensory input

• To regulate blood flow to the brain

• To prevent unwanted muscle movements

• To enhance muscle movement

What analogy is used to describe the thalamus in the context of the indirect pathway?

• A quiet bird

• An excited puppy

• A sleepy dog

• A calm cat

How does the globus pallidus internal control the thalamus?

• By sending excitatory messages

• By sending inhibitory messages

• By increasing blood flow

• By reducing sensory input

What is the effect of tightening the leash on the thalamus?

• Increased muscle movement

• Decreased sensory input

• Decreased muscle movement

• Increased sensory input

What role does the striatum play in the indirect pathway?

• It sends inhibitory messages to the globus pallidus external

• It excites the thalamus directly

• It inhibits the motor cortex

• It increases sensory input to the brain

Which part of the brain sends excitatory messages to the striatum in the indirect pathway?

• The thalamus

• The motor cortex

• The substantia nigra

• The globus pallidus internal

What happens when the subthalamic nucleus is excited?

• It reduces activity in the striatum

• It directly excites the motor cortex

• It inhibits the globus pallidus internal

• It excites the globus pallidus internal

How does the substantia nigra adjust the leash on the thalamus?

• By reducing blood flow to the brain

• By directly exciting the motor cortex

• By sending dopamine to the striatum

• By inhibiting the subthalamic nucleus

What is the role of dopamine in the indirect pathway?

• To inhibit the motor cortex

• To excite the thalamus

• To increase sensory input

• To adjust the leash on the thalamus

What happens when the substantia nigra sends dopamine to the striatum?

• The thalamus is directly excited

• The globus pallidus external becomes more active

• The motor cortex is inhibited

• The subthalamic nucleus is inhibited