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Basal Nuclei (Basal Ganglia)

  • The basal nuclei (or ganglia) are collections of subcortical nuclei (or gray matter) in each hemisphere that help regulate voluntary movements that are selected, planned, and executed elsewhere in the brain.
  • Each basal nucleus basically consists of four masses: the image descriptioncaudate nucleus, the image descriptionputamen, the image descriptionglobus pallidus, and the image descriptionsubstantia nigra.
An image showing the Basal Nuclei, lateral view and coronal section of the brain
An image showing the Basal Nuclei (Thalamus) is labeled, lateral view and coronal section of the brain
An image showing the Basal Nuclei (Caudate nucleus, and Thalamus) are labeled, lateral view and coronal section of the brain
An image showing the Basal Nuclei (Putamen, Caudate nucleus, and Thalamus) are labeled, lateral view and coronal section of the brain
An image showing the Basal Nuclei (Globus pallidus, Putamen, Caudate nucleus, and Thalamus) are labeled, lateral view and coronal section of the brain
An image showing the Basal Nuclei (Substantia nigra, Globus pallidus, Putamen, Caudate nucleus, and Thalamus) are labeled, lateral view and coronal section of the brain
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  • The caudate nucleus and putamen receive information from many parts of the sensory and motor cortices.
  • These areas, in turn, communicate with the globus pallidus, which sends output information back to the motor cortices by way of the thalamus.
  • Signals sent from substantia nigra to the caudate and putamen modulate the output from the globus pallidus.
  • Through these connections, the basal nuclei help initiate and coordinate many of the slow, stereotypic activities, such as walking, while inhibiting many unwanted or unnecessary movements.

Overview:

Test yourself image showing the Basal Nuclei (Substantia nigra, Globus pallidus, Putamen, Caudate nucleus, and Thalamus) are numbered without answers, lateral view and coronal section of the brain
Test yourself image showing the Basal Nuclei (Substantia nigra, Globus pallidus, Putamen, Caudate nucleus, and Thalamus) are numbered with answers below, lateral view and coronal section of the brain
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