Basal Ganglia Quiz: 15 Questions With Answers
Updated
The basal ganglia use direct and indirect pathways to facilitate and suppress movement. Parkinson's disease results from dopamine loss in the substantia nigra pars compacta, reducing direct pathway activity. Subthalamic nucleus damage can cause hemiballismus.
This quiz tests your understanding of the basal ganglia, a group of subcortical nuclei essential for motor control, habit learning, and reward processing. Ideal for neuroscience students, medical learners, or anyone curious about how the brain initiates and refines movement. You'll encounter questions on the caudate, putamen, globus pallidus, subthalamic nucleus, substantia nigra, and the circuits linking them.
Before you begin, recall that the basal ganglia exert their influence by modulating the thalamus: they tonically inhibit it, and temporarily releasing that inhibition allows movement. Two parallel pathways—the direct and indirect—compete to control this release. Dopamine from the substantia nigra biases the system toward the direct pathway, promoting movement.
The questions
Which two nuclei make up the striatum?
Which nucleus is the main output of the basal ganglia to the thalamus?
Which neurotransmitter is deficient in Parkinson's disease?
What is the effect of direct pathway activation on movement?
Damage to which nucleus causes hemiballismus?
What is the correct sequence of the indirect pathway?
Which dopamine receptor is primarily responsible for exciting striatal neurons in the direct pathway?
Which disease is characterized by chorea and results from degeneration of striatal neurons in the indirect pathway?
In the indirect pathway, what is the role of the subthalamic nucleus?
Which part of the substantia nigra contains dopaminergic neurons that project to the striatum?
In Parkinson's disease, reduced dopamine leads to what change in basal ganglia output?
Which basal ganglia structure is the primary recipient of direct excitatory input from the cerebral cortex?
In the direct pathway, what effect does striatal activation have on the globus pallidus internal segment?
What is the primary role of the basal ganglia in motor control?
Which structure does the globus pallidus external segment inhibit in the indirect pathway?
0 of 15 answered · 0 correct
Cheat sheet: key terms
| Direct pathway | Striatal neurons projecting to GPi/SNr; activation releases thalamic inhibition and facilitates movement. |
|---|---|
| Indirect pathway | Striatal neurons projecting to GPe, then STN, then GPi; activation increases thalamic inhibition and suppresses movement. |
| Substantia nigra pars compacta | Dopaminergic neurons that enhance direct pathway and inhibit indirect pathway via D1 and D2 receptors. |
| Subthalamic nucleus | Excitatory nucleus that drives GPi; damage causes hemiballismus, a violent flinging of limbs. |
| Parkinson's disease | Loss of dopamine neurons leads to bradykinesia, rigidity, and resting tremor, due to reduced direct and increased indirect pathway activity. |
| Huntington's disease | Degeneration of striatal indirect pathway neurons causes chorea, a hyperkinetic movement disorder. |
| Globus pallidus internal segment | Main basal ganglia output nucleus; tonically inhibits the thalamus and thus movement. |
Answers explained
Show all 15 answers
- Which two nuclei make up the striatum? Caudate and putamen. The striatum consists of the caudate nucleus and the putamen, which receive cortical input and are the main input nuclei of the basal ganglia.
- Which nucleus is the main output of the basal ganglia to the thalamus? Globus pallidus internal segment. The globus pallidus internal segment, along with the substantia nigra pars reticulata, provides the main inhibitory output to the thalamus.
- Which neurotransmitter is deficient in Parkinson's disease? Dopamine. Parkinson's disease is caused by degeneration of dopaminergic neurons, primarily in the substantia nigra pars compacta.
- What is the effect of direct pathway activation on movement? It facilitates movement. The direct pathway reduces inhibition of the thalamus, thereby facilitating movement.
- Damage to which nucleus causes hemiballismus? Subthalamic nucleus. Hemiballismus, characterized by violent flinging movements, results from damage to the subthalamic nucleus.
- What is the correct sequence of the indirect pathway? Striatum → GPe → STN → GPi. The indirect pathway goes from striatum to globus pallidus external segment, then to subthalamic nucleus, and finally to globus pallidus internal segment.
- Which dopamine receptor is primarily responsible for exciting striatal neurons in the direct pathway? D1. Dopamine excites direct pathway striatal neurons via D1 receptors, which are coupled to stimulatory G-proteins.
- Which disease is characterized by chorea and results from degeneration of striatal neurons in the indirect pathway? Huntington's disease. Huntington's disease is a hyperkinetic disorder caused by loss of indirect pathway striatal neurons, leading to chorea.
- In the indirect pathway, what is the role of the subthalamic nucleus? It excites the globus pallidus internal segment. The subthalamic nucleus sends excitatory projections to the globus pallidus internal segment, increasing its inhibition of the thalamus.
- Which part of the substantia nigra contains dopaminergic neurons that project to the striatum? Pars compacta. Dopaminergic neurons are located in the substantia nigra pars compacta and project to the striatum via the nigrostriatal pathway.
- In Parkinson's disease, reduced dopamine leads to what change in basal ganglia output? Increased inhibition of the thalamus. Loss of dopamine reduces direct pathway activity and increases indirect pathway activity, resulting in excessive inhibition of the thalamus.
- Which basal ganglia structure is the primary recipient of direct excitatory input from the cerebral cortex? Striatum (caudate and putamen). The striatum (caudate and putamen) is the primary input structure, receiving excitatory glutamatergic projections from nearly all cortical areas.
- In the direct pathway, what effect does striatal activation have on the globus pallidus internal segment? It inhibits it. In the direct pathway, striatal neurons release GABA to inhibit the globus pallidus internal segment, reducing its inhibition of the thalamus.
- What is the primary role of the basal ganglia in motor control? Selecting and scaling motor programs. The basal ganglia do not initiate movement directly; they select appropriate motor programs and scale their amplitude and force by modulating thalamocortical circuits.
- Which structure does the globus pallidus external segment inhibit in the indirect pathway? Subthalamic nucleus. The globus pallidus external segment sends inhibitory (GABAergic) projections to the subthalamic nucleus, forming part of the indirect pathway.
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