Pedunculo-pontine nucleus

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Lothric

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So the basal ganglia are important in voluntary movements and making postural adjustments. When the outputs go down in the corticospinal tract, one can see in FA that the descending axons eventually pass the "pedunculopontine nucleus".

What happens there? It does not look like a synapse is occuring (as the output is an intact downpointing arrow). Doesn't look like a nucleus whose function is that known either (Google won't help), but the litte that can be read suggests that this nucleus is important for voluntary movement. Could it simply just be that this nucleus, in conjunction with the cortex, sends axons that follow the same descending pathway?

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