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Neuroscience: Neural Impulses and Movement Control

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Neuroscience: Neural Impulses and Movement Control

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Questions and Answers

What is the role of the subthalamic nucleus (STN) in relation to the globus pallidus interna (GPi)?

It promotes movement by inhibiting the GPi.

It acts as a brake on the GPi, leading to a cessation of movement. (correct)

It has no significant interaction with the GPi.

It stimulates thalamic output, counteracting GPi inhibition.

What effect does insufficient stimulation of dopamine receptors in the striatum have on the basal ganglia?

It causes either under- or over-stimulation of specific basal ganglia areas. (correct)

It exclusively promotes motor activity in the thalamus.

It leads to a balanced stimulation of the GPi and STN.

It results in enhanced dopamine receptor responsiveness.

How does excessive stimulation of the GPi affect thalamic output?

It directly activates dopamine neurons in the striatum.

It exerts an excessive inhibitory influence on the thalamus. (correct)

It increases thalamic output, facilitating movement.

It has no effect on thalamic activity.

What is one result of increased rigidity due to basal ganglia dysfunction?

<p>Cessation of movement.</p> Signup and view all the answers

What is a primary consequence of reduced thalamic output due to increased GPi activity?

<p>Contributions to tremors.</p> Signup and view all the answers

Study Notes

Neural Impulses

Neural impulses transmit signals between neurons, crucial for communication from the brain to the spinal cord and muscles.
Rapid transmission of these impulses is vital for coordinated movements and reflex actions.

Dopamine and the Basal Ganglia

Insufficient stimulation of dopamine receptors in the striatum affects the basal ganglia's function.
This imbalance can lead to either under- or over-stimulation of specific brain areas.

Subthalamic Nucleus (STN)

Excessive activity in the STN acts as a brake on the globus pallidus interna (GPi).
Increased STN activity is linked to a reduction in movement and heightened rigidity in muscles.

Globus Pallidus Interna (GPi)

Over-stimulation of the GPi leads to excessive inhibition of the thalamus.
This inhibition diminishes thalamic output, contributing to the onset of tremors in the body.

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Description

This quiz explores the intricate processes of neural impulses, their transmission from neurons to muscles, and the role of dopamine receptors in movement regulation. It delves into the function of the basal ganglia and how dysregulation can lead to movement disorders, focusing particularly on the subthalamic nucleus and globus pallidus internus interactions.