General Features

The basal ganglia initiate and provide gross control over skeletal muscle movements. The major components of the basal ganglia include:

• Striatum, which consists of the caudate nucleus and the putamen

• External and internal segments of the globus pallidus

• Substantia nigra

• Subthalamic nucleus

Together with the cerebral cortex and die VL nucleus of the thalamus, these structures are interconnected to form two parallel but antagonistic circuits known as the direct and indirect basal ganglia pathways (Figures IV-9-1 and IV-9-2). Both pathways are driven by extensive inputs from large areas of cerebral cortex, and both project back to the motor cortex after a relay in the VL nucleus of the thalamus. Both pathways use a process known as "disinhibition" to mediate their effects, whereby one population of inhibitory neurons inhibits a second population of inhibitory neurons.

Was this article helpful?

0 0
31 Days To Bigger Arms

31 Days To Bigger Arms

You can have significantly bigger arms in only 31 days. How much bigger? That depends on a lot of factors. You werent able to select your parents so youre stuck with your genetic potential to build muscles. You may have a good potential or you may be like may of the rest of us who have averages Potential. Download this great free ebook and start learns how to build your muscles up.

Get My Free Ebook


Post a comment