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Neuroanatomy

Basal Ganglia/Nuclei

QuestionAnswer
What are the components of the Basal Ganglia? Corpus Striatum, Globus Pallidus, Subthalamic Nucleus, and Substantia Niagra
What two components make up the corpus striatum? Caudate nucleus and putamen
Globus pallidus consists of? GPe & GPi
The putamen and the globus pallidus make up the? Lentiform Nucleus
This structures function is to modulate motor control centers of the cerebral cortex by influencing output from the cerebral cortex to the SC, modulate behavior and cognition, and is responsible for scaling intensity of mvmt or cognitive responses. Basal Ganglia
The caudate carries? specialized information(e.g. eye mvmt)
The putamen is more __________ motor. Generalized(body mvmt)
_______ and _______ are major output nuclei to the cortex from the basal ganglia. Globus Pallidus & Substantia Niagra
Does the basal ganglia have significant output to LMN? No
How does the basal ganglia do its work? It influences the cerebral cortex
These fibers connect ipsilateral neocortex to the corpus striatum and are considered afferents to the basal ganglia. Corticostriate Fibers
The putamen receives input from the premotor and supplementary motor cortex via these fibers. Corticostriate
Corticostriate fibers carry what kind of info? Slower mvmts, large muscle groups as well as complex voluntary mvmts.
What basal ganglia afferent connects the thalamus to the ipsilateral corpus striatum Thalamostriate
What carries important information about external events affecting our sensory system. Thalamostriate
The globus pallidus and the pars reticulata send _________ projections to the thalamus via _________ amino acid? Inihibitory, GABA
The thalamus sends excitatory input to the cerebral cortex via the? Thalamocortical projections
Does the thalamus normally send excitatory or inhibitory input? inhibitory
How does mvmt occur? Thalamic cells are released from tonic inhibition.(inhibit inhibition=excitation)
What efferent connects the globus pallidus to the ipsilateral thalamus? Pallidothalamic Fibers
What efferent connects the globus pallidus to the tegmentum? Pallidotegmental Fibers
What are the input nuclei to the basal ganglia? Caudate and putamen
The direct pathway results in inhibition or excitation of the thalamus? Inhibition
By inhibiting the thalamus, the direct pathway inhibits or excites the supplementary motor area? Excites
The indirect pathway has an inhibitory or excitatory effect on the upper motor neurons? inhibitory
Where is GABA located and is it excitatory or inhibitory? SC interneurons/inhibitory
Where is dopamine located and is it excitatory or inhibitory? Substantia niagra/inhibitory
Where is glutamate located and is it excitatory or inhibitory? SC interneuron/excitatory
What are the major output nuclei of the basal ganglia? Globus pallidus and substantia nigra
Created by: txst fall 2008